Mars

rocket-lab-entered-“hero-mode”-to-finish-mars-probes—now-it’s-up-to-blue-origin

Rocket Lab entered “hero mode” to finish Mars probes—now it’s up to Blue Origin

blue origin, Commercial space, escapade, heliophysics, launch, Mars, new glenn, rocket lab, Science, Space / /
The two spacecraft for NASA's ESCAPADE mission at Rocket Lab's factory in Long Beach, California.

Enlarge / The two spacecraft for NASA’s ESCAPADE mission at Rocket Lab’s factory in Long Beach, California.

Two NASA spacecraft built by Rocket Lab are on the road from California to Florida this weekend to begin preparations for launch on Blue Origin’s first New Glenn rocket.

These two science probes must launch between late September and mid-October to take advantage of a planetary alignment between Earth and Mars that only happens once every 26 months. NASA tapped Blue Origin, Jeff Bezos’ space company, to launch the Escape and Plasma Acceleration and Dynamics Explorers (ESCAPADE) mission with a $20 million contract.

Last November, the space agency confirmed the $79 million ESCAPADE mission will launch on the inaugural flight of Blue Origin’s New Glenn rocket. With this piece of information, the opaque schedule for Blue Origin’s long-delayed first New Glenn mission suddenly became more clear.

The launch period opens on September 29. The two identical Mars-bound spacecraft for the ESCAPADE mission, nicknamed Blue and Gold, are now complete. Rocket Lab announced Friday that its manufacturing team packed the satellites and shipped them from their factory in Long Beach, California. Over the weekend, they arrived at a clean room facility just outside the gates of NASA’s Kennedy Space Center in Florida, where technicians will perform final checkups and load hydrazine fuel into both spacecraft, each a little more than a half-ton in mass.

Then, if Blue Origin is ready, ground teams will connect the ESCAPADE spacecraft with the New Glenn’s launch adapter, encapsulate the probes inside the payload fairing, and mount them on top of the rocket.

“There’s a whole bunch of checking and tests to make sure everything’s OK, and then we move into fueling, and then we integrate with the launch vehicle. So it’s a big milestone,” said Rob Lillis, the mission’s lead scientist from the University of California Berkeley’s Space Science Laboratory. “There have been some challenges along the way. This wasn’t easy to make happen on this schedule and for this cost. So we’re very happy to be where we are.”

Racing to the finish line

But there’s a lot for Blue Origin to accomplish in the next couple of months if the New Glenn rocket is going to be ready to send the ESCAPADE mission toward Mars in this year’s launch period. Blue Origin has not fully exercised a New Glenn rocket during a launch countdown, hasn’t pumped a full load of cryogenic propellants into the launch vehicle, and hasn’t test-fired a full complement of first stage or second stage engines.

These activities typically take place months before the first launch of a large new orbital-class rocket. For comparison, SpaceX test-fired its first fully assembled Falcon 9 rocket on the launch pad about three months before its first flight in 2010. United Launch Alliance completed a hot-fire test of its new Vulcan rocket on the launch pad last year, about seven months before its inaugural flight.

However, Blue Origin is making visible progress toward the first flight of New Glenn, after years of speculation and few outward signs of advancement. Earlier this year, the company raised a full-scale, 320-foot-tall (98-meter) New Glenn rocket on its launch pad at Cape Canaveral Space Force Station and loaded it with liquid nitrogen, a cryogenic substitute for the methane and liquid hydrogen fuel it will burn in flight.

Rocket Lab entered “hero mode” to finish Mars probes—now it’s up to Blue Origin Read More »

no,-nasa-hasn’t-found-life-on-mars-yet,-but-the-latest-discovery-is-intriguing

No, NASA hasn’t found life on Mars yet, but the latest discovery is intriguing

Life on Mars, Mars, perseverance, Science, Space / /

Look at the big brain on percy —

“These spots are a big surprise.”

–

NASA’s Perseverance rover discovered “leopard spots” on a reddish rock nicknamed “Cheyava Falls” in Mars’ Jezero Crater in July 2024.

Enlarge / NASA’s Perseverance rover discovered “leopard spots” on a reddish rock nicknamed “Cheyava Falls” in Mars’ Jezero Crater in July 2024.

NASA/JPL-Caltech/MSSS

NASA’s Perseverance rover has found a very intriguing rock on the surface of Mars.

An arrowhead-shaped rock observed by the rover has chemical signatures and structures that could have been formed by ancient microbial life. To be absolutely clear, this is not irrefutable evidence of past life on Mars, when the red planet was more amenable to water-based life billions of years ago. But discovering these colored spots on this rock is darn intriguing and has Mars scientists bubbling with excitement.

“These spots are a big surprise,” said David Flannery, an astrobiologist and member of the Perseverance science team from the Queensland University of Technology in Australia, in a NASA news release. “On Earth, these types of features in rocks are often associated with the fossilized record of microbes living in the subsurface.”

What the rover found

This is a very recent discovery, and the science has not yet been peer-reviewed. The sample was collected on July 21—a mere four days ago—as the rover explored the Neretva Vallis riverbed. This valley was formed long ago when water rushed into Jezero Crater.

The science team operating Perseverance has nicknamed the rock Chevaya Falls and subjected it to multiple scans by the rover’s SHERLOC (Scanning Habitable Environments with Raman & Luminescence for Organics & Chemicals) instrument. The distinctive colorful spots, containing both iron and phosphate, are a smoking gun for certain chemical reactions—rather than microbial life itself.

On Earth, microbial life can derive energy from these kinds of chemical reactions. So, what we have here is a plausible source of energy for microbes on Mars. In addition, there are organic chemicals present on the same rock, which is consistent with something living there. From this, it is tempting to jump to the idea of microbes living on a rock, eons ago, in a Martian river. But this is not direct evidence of life.

NASA has a seven-step process for determining whether something can be confirmed as extraterrestrial life. This is known as the CoLD scale, for Confidence of Life Detection. In this case, the detection of these spots on a Martian rock represents just the first of seven steps—for example, scientists must still rule out non-biological possibility and identify other signals to have confidence in off-world life.

Bring them home

According to NASA, Perseverance has used all of its available instrumentation to study Chevaya Falls. “We have zapped that rock with lasers and X-rays and imaged it literally day and night from just about every angle imaginable,” said Ken Farley, Perseverance project scientist. “Scientifically, Perseverance has nothing more to give.”

The discovery provides some wind in the sails for NASA’s flagging efforts to devise and fly a Mars Sample Return mission. The agency’s most recent plan, costing $11 billion, was determined to be too expensive. Now, the space agency is asking the industry for help. In June it commissioned 10 studies on alternative means of returning rocks from Mars sooner, and presumably for a lower cost.

Now, scientists can point to rocks like Chevaya Falls and say this is precisely why they must be studied in ultra-capable labs back on Earth.

No, NASA hasn’t found life on Mars yet, but the latest discovery is intriguing Read More »

seismic-data-shows-mars-is-often-pummeled-by-planet-shaking-meteorites

Seismic data shows Mars is often pummeled by planet-shaking meteorites

astronomy, Impacts, Mars, meteorites, planetary science, Science, seismology / /

Brace for impact —

Seismic information now allows us to make a planet-wide estimate of impact rates.

–

One of the craters identified seismically, then confirmed through orbital images.

Enlarge / One of the craters identified seismically, then confirmed through orbital images.

Mars trembles with marsquakes, but not all of them are driven by phenomena that occur beneath the surface—many are the aftermath of meteorite strikes.

Meteorites crash down to Mars every day. After analyzing data from NASA’s InSight lander, an international team of researchers noticed that its seismometer, SEIS, detected six nearby seismic events. These were linked to the same acoustic atmospheric signal that meteorites generate when whizzing through the atmosphere of Mars. Further investigation identified all six as part of an entirely new class of quakes known as VF (very high frequency) events.

The collisions that generate VF marsquakes occur in fractions of a second, much less time than the few seconds it takes tectonic processes to cause quakes similar in size. This is some of the key seismological data that has helped us understand the occurrence of earthquakes caused by meteoric impacts on Mars. This is also the first time seismic data was used to determine how frequently impact craters are formed.

“Although a non-impact origin cannot be definitively excluded for each VF event, we show that the VF class as a whole is plausibly caused by meteorite impacts,” the researchers said in a study recently published in Nature.

Seismic shift

Scientists had typically determined the approximate meteorite impact rate on Mars by comparing the frequency of craters on its surface to the expected rate of impacts calculated using counts of lunar craters that were left behind by meteorites. Models of the lunar cratering rate were then adjusted to fit Martian conditions.

Looking to the Moon as a basis for comparison was not ideal, as Mars is especially prone to being hit by meteorites. The red planet is not only a more massive body that has greater gravitational pull, but it is located near the asteroid belt.

Another issue is that lunar craters are often better preserved than Martian craters because there is no place in the Solar System dustier than Mars. Craters in orbital images are often partly obscured by dust, which makes them difficult to identify. Sandstorms can complicate matters by covering craters in more dust and debris (something that cannot occur on the Moon due to the absence of wind).

InSight deployed its SEIS instrument after it landed in the Elysium Planitia region of Mars. In addition to detecting tectonic activity, the seismometer can potentially determine the impact rate through seismic data. When meteorites strike Mars, they produce seismic waves just like tectonic marsquakes do, and the waves can be detected by seismometers when they travel through the mantle and crust. An immense quake picked up by SEIS was linked to a crater 150 meters (492 feet) wide. SEIS would later detect five more marsquakes that were all associated with an acoustic signal (detected by a different sensor on InSight) that is a telltale sign of a falling meteorite.

A huge impact

Something else stood out about the six impact-driven marsquakes detected with seismic data. Because of the velocity of meteorites (over 3,000 meters or 9,842 feet per second), these events happened faster than any other type of marsquake, even faster than quakes in the high frequency (HF) class. That’s how they earned their own classification: very high frequency, or VF, quakes. When the InSight team used the Mars Reconnaissance Orbiter’s (MRO) Context Camera (CTX) to image the locations of the events picked up by SEIS, there were new craters present in the images.

There are additional seismic events that haven’t been assigned to craters yet. They are thought to be small craters formed by meteorites about the size of basketballs, which are extremely difficult to see in orbital images from MRO.

The researchers were able to use SEIS data to estimate the diameters of craters based on distance from InSight (according to how long it took seismic waves to reach the spacecraft) and the magnitude of the VF marsquakes associated with them. They were also able to derive the frequency of quakes picked up by SEIS. Once a frequency estimate based on the data was applied to the entire surface area of Mars, they estimated that around 280 to 360 VF quakes occur each year.

“The case is strong that the unique VF marsquake class is consistent with impacts,” they said in the same study. “It is, therefore, worthwhile considering the implications of attributing all VF events to meteoroid impacts.”

Their detection has added to the estimated number of impact craters on Mars since many could not be seen from space before. What can VF impacts tell us? The impact rate on a planet or moon is important for determining the age of that object’s surface. Using impacts has helped us determine that the surface of Venus is constantly being renewed by volcanic activity, while most of the surface of Mars has not been covered in lava for billions of years.

Figuring out the rate of meteorite impacts can also help protect spacecraft and, someday, maybe Martian astronauts, from potential hazards. The study suggests that there are periods where impacts are more or less frequent, so it might be possible to predict when the sky is a bit more likely to be clear of falling space rocks—and when it isn’t. Meteorites are not much of a danger to Earth since most of them burn up in the atmosphere. Mars has a much thinner atmosphere that more can make it through, and there is no umbrella for a meteor shower.

Nature Astronomy, 2024. DOI: 10.1038/s41550-024-02301-z

Seismic data shows Mars is often pummeled by planet-shaking meteorites Read More »

mars-may-not-have-had-liquid-water-long-enough-for-life-to-form

Mars may not have had liquid water long enough for life to form

astronomy, carbon dioxide, Mars, planetary science, Science, water / /

Subliminal —

Lab experiments suggest gullies on Mars might form when carbon dioxide heats up.

–

Image of a grey-colored slope with channels cut into it.

Mars has a history of liquid water on its surface, including lakes like the one that used to occupy Jezero Crater, which have long since dried up. Ancient water that carried debris—and melted water ice that presently does the same—were also thought to be the only thing driving the formation of gullies spread throughout the Martian landscape. That view may now change thanks to new results that suggest dry ice can also shape the landscape.

It’s sublime

Previously, scientists were convinced that only liquid water shaped gullies on Mars because that’s what happens on Earth. What was not taken into account was sublimation, or the direct transition of a substance from a solid to a gaseous state. Sublimation is how CO2 ice disappears (sometimes water ice experiences this, too).

Frozen carbon dioxide is everywhere on Mars, including in its gullies. When CO2 ice sublimates on one of these gullies, the resulting gas can push debris further down the slope and continue to shape it.

Led by planetary researcher Lonneke Roelofs of Utrecht University in the Netherlands, a team of scientists has found that the sublimation of CO2 ice could have shaped Martian gullies, which might mean the most recent occurrence of liquid water on Mars may have been further back in time than previously thought. That could also mean the window during which life could have emerged and thrived on Mars was possibly smaller.

“Sublimation of CO2 ice, under Martian atmospheric conditions, can fluidize sediment and creates morphologies similar to those observed on Mars,” Roelofs and her colleagues said in a study recently published in Communications Earth & Environment.

Into thin air

Earth and Martian gullies have basically the same morphology. The difference is that we’re certain that liquid water is behind their formation and continuous shaping and re-shaping on Earth. Such activity includes new channels being carved out and more debris being taken to the bottom.

While ancient Mars may have had enough stable liquid water to pull this off, there is not enough on the present surface of Mars to sustain that kind of activity. This is where sublimation comes in. CO2 ice has been observed on the surface of Mars at the same time that material starts flowing.

After examining observations like these, the researchers hypothesized these flows are pushed downward by gas as the frozen carbon dioxide sublimates. Because of the low pressure on Mars, sublimation creates a relatively greater gas flux than it would on Earth—enough power to make fluid motion of material possible.

There are two ways sublimation can be triggered to get these flows moving. When part of a more exposed area of a gully collapses, especially on a steep slope, sediment and other debris that have been warmed by the Sun can fall on CO2 ice in a shadier and cooler area. Heat from the falling material could supply enough energy for the frost to sublimate. Another possibility is that CO2 ice and sediment can break from the gully and fall onto warmer material, which will also trigger sublimation.

Mars in a lab

There is just one problem with these ideas: since humans have not landed on Mars (yet), there are no in situ observations of these phenomena, only images and data beamed back from spacecraft. So, everything is hypothetical. The research team would have to model Martian gullies to watch the action in real time.

To re-create a part of the red planet’s landscape in a lab, Roelofs built a flume in a special environmental chamber that simulated the atmospheric pressure of Mars. It was steep enough for material to move downward and cold enough for CO2 ice to remain stable. But the team also added warmer adjacent slopes to provide heat for sublimation, which would drive movement of debris. They experimented with both scenarios that might happen on Mars: heat coming from beneath the CO2 ice and warm material being poured on top of it. Both produced the kinds of flows that had been hypothesized.

For further evidence that flows driven by sublimation would happen under certain conditions, two further experiments were conducted, one under Earth-like pressures and one without CO2 ice. No flows were produced by either.

“For the first time, these experiments provide direct evidence that CO2 sublimation can fluidize, and sustain, granular flows under Martian atmospheric conditions,” the researchers said in the study.

Because this experiment showed that gullies and systems like them can be shaped by sublimation and not just liquid water, it raises questions about how long Mars had a sufficient supply of liquid water on the surface for any organisms (if they existed at all) to survive. Its period of habitability might have been shorter than it was once thought to be. Does this mean nothing ever lived on Mars? Not necessarily, but Roelofs’ findings could influence how we see planetary habitability in the future.

Communications Earth & Environment, 2024. DOI: 10.1038/s43247-024-01298-7

Mars may not have had liquid water long enough for life to form Read More »

elon-musk:-spacex-needs-to-build-starships-as-often-as-boeing-builds-737s

Elon Musk: SpaceX needs to build Starships as often as Boeing builds 737s

elon musk, Mars, Space, spacex, starship / /
Ship 28, the Starship for SpaceX's next full-scale test flight, fires up one of its engines on December 29 in Texas.

Enlarge / Ship 28, the Starship for SpaceX’s next full-scale test flight, fires up one of its engines on December 29 in Texas.

SpaceX

It’s no secret that Elon Musk has big ambitions for SpaceX’s Starship mega-rocket. This is the vehicle that, with plenty of permutations and upgrades, Musk says will ferry cargo and people across the Solar System to build a settlement on Mars, making humanity a multi-planetary species and achieving the billionaire’s long-standing dream.

Of course, that is a long way off. SpaceX is still working on getting Starship into orbit or close to it, an achievement that appears to be possible this year. Then, the company will start launching Starlink satellites on Starship missions while testing in-space refueling technology needed to turn Starship into a human-rated Moon lander for NASA.

SpaceX’s South Texas team is progressing toward the third full-scale Starship test flight. On December 20, the Starship’s upper stage slated for the next test flight completed a test-firing of its Raptor engines at the Starbase launch site on the Texas Gulf Coast. Nine days later, the 33-engine Super Heavy booster fired up on the launch pad for its own static fire test. On the same day, SpaceX hot-fired the Starship upper stage once again on a test stand next to the launch pad.

With those milestones complete, ground teams rolled the booster back to its hangar for final preflight checks and reconfigurations. The ship, too, will need to be rolled back to its high bay.

SpaceX could be weeks away from having both vehicles ready to fly, but the company hasn’t released an update on lessons learned from the previous Starship test flight in November. That flight was largely successful, with apparently flawless performance from the 33 engines on the Super Heavy booster during launch. The Starship upper stage reached space before self-destructing downrange over the Gulf of Mexico. The booster exploded during a maneuver to bring itself back to Earth for a controlled splashdown at sea.

The company’s engineers will want to understand and correct whatever caused those issues. The Federal Aviation Administration then needs to approve SpaceX’s investigation into the last Starship flight before issuing a new commercial launch license. When it flies again, Starship will try to reach near orbital velocity, enough speed to travel most of the way around the world before reentering the atmosphere near Hawaii.

Verifying the performance of Starship’s heat shield tiles during reentry will be valuable learning for SpaceX, but Starship first needs to be fully successful with a launch. This is just the start for the privately funded Starship program.

Elon Musk: SpaceX needs to build Starships as often as Boeing builds 737s Read More »