Universe Today

July 24, 2023July 24, 2023 by Matt Williams

This Mess of Boulders Was Deposited by an Ancient River on Mars

The Mastcam-Z imager on NASA's Perseverance rover captured a series of images on July 6 that were stitched together to show a field of boulders deposited in Jezero Crater by a fast-moving ancient river. Credit: NASA/JPL-Caltech/ASU/MSSS

Since the Viking 1 and 2 missions visited Mars in 1976, scientists have been confronted with mounting evidence that Mars once had flowing water on its surface. The images collected by the twin Viking landers and orbiters showed clear signs of ancient flow channels, alluvial deposits, and weathered rocks. Thanks to the dozens of additional orbiters, landers, and rovers sent that have been sent there since scientists have been getting a clearer picture of what Mars once looked like. At the end of this journey, they hope to find evidence (if there’s any to be found) that Mars once supported life and still does today.

The latest evidence of Mars’ warmer watery past comes to us courtesy of NASA’s Perseverance rover, which continues to explore the Jezero Crater and obtain samples for the first Mars sample-return mission. On Friday, June 23rd, the rover obtained its 20th sample, which was drilled from a rocky outcropping known as “Emerald Lake.” Named “Otis Peak,” this sample is part of an outcropping formed by mineral deposits transported by an ancient river and could contain invaluable geological information about the many places these minerals came from.

July 24, 2023July 24, 2023 by Andy Tomaswick

Engineers Design a Robot That Can Stick To, Crawl Along, and Sail Around Rubble Pile Asteroids

Asteroids come in many shapes and sizes. Most are spherical, though many have a feature that can make them difficult to land on – they are essentially just collections of rocks loosely bound together by gravity. In space exploration jargon, they are known as “rubble piles.” Many of the asteroids humanity has visited are considered rubble piles, including Itokawa and Dimorphos, the destinations for Hayabusa and DART, respectively. But, as the trials of the Philae spacecraft showed when it tried to meet up with the comet 67P/Churyumov-Gerasimenko, landing on these objects with very low surface gravity can be difficult. Enter a new concept from researchers at the University of Colorado, Boulder. Their idea, known as Area-of-Effect Softbots (AoES), could help future asteroid explorers, and even miners, overcome some of the challenges facing them at these small bodies.

July 24, 2023July 24, 2023 by Brian Koberlein

Venus Needed Asteroid Impacts to Get its Volcanoes Going

Illustration of early Venus after a major impact. Credit: Southwest Research Institute

With its thick, cloudy atmosphere, Venus has long held mysteries about its surface. It was only in the late 20th century that astronomers had detailed observations of the Venusian landscape, with the Russian Venera landers in the 1970s and 1980s, and later the 1990 Magellan mission, which made high-resolution radar maps of the surface. There are many things we still don’t know, but one thing we do know is that the surface of Venus is young. And a new study in Nature Astronomy may know why.

July 23, 2023July 23, 2023 by Carolyn Collins Petersen

An Enormous Cosmological Simulation Wraps Up, Recreating Even More of the Universe

In shaping the Universe, gravity builds a vast cobweb-like structure of filaments tying galaxies and clusters of galaxies together along invisible bridges hundreds of millions of light-years long. A galaxy can move into and out of the densest parts of this web throughout its lifetime. Credit: Volker Springel (Max Planck Institute for Astrophysics) et al.

There’s an old joke among astronomy students about a question on the final exam for a cosmology class. It goes like this: “Describe the Universe and give three examples.” Well, a team of researchers in Germany, the U.S., and the UK took a giant leap toward giving at least one accurate example of the Universe.

July 23, 2023July 23, 2023 by Matt Williams

A Massive Galaxy With Almost No Dark Matter

This is an image of NGC 1277 taken by the Hubble Space Telescope. Credit: ESA/Hubble

According to our predominant cosmological models, Dark Matter accounts for roughly 85% of the mass in the Universe. While ongoing efforts to study this mysterious, invisible mass have yielded no direct evidence, astrophysicists have been able to measure its influence by observing Dark Matter Haloes, gravitational lenses, and the effect of General Relativity on large-scale cosmic structures. And with the help of next-generation missions like the ESA’s Euclid and NASA’s Nancy Grace Roman space telescopes, Dark Matter may not be a mystery for much longer!

And then something like this comes along: a massive galaxy that appears to have little or no Dark Matter! This is precisely what a team of astronomers led by members of the Instituto Astrofisica de Canarias (IAC) noticed when observing NGC 1277. This lenticular galaxy, located 240 million light-years away in the constellation Perseus, is several times more massive than the Milky Way. This is the first time a massive galaxy has been found that doesn’t show signs of Dark Matter, which is a serious challenge to our current cosmological models.

July 22, 2023July 22, 2023 by Laurence Tognetti

NASA Astronauts Get a New Ride at Kennedy Space Center

NASA’s new custom-designed, fully electric, environmentally friendly crew transportation vehicles for the upcoming Artemis missions, which were delivered to NASA’s Kennedy Space Center on July 11, 2023. These new vehicles will ferry Artemis astronauts to Launch Complex 39B for their missions beginning with Artemis II, and were delivered by the manufacturer, Canoo Technologies Inc. (Credit: NASA/Isaac Watson)

In its continued support for the Artemis missions, a three fully-electric, environmentally friendly, and specially designed vehicles were recently delivered to NASA for the purpose of ferrying future Artemis astronauts from their crew quarters to historic Launch Pad 39B before their journey to the Moon. The vehicles were built and delivered by Canoo Technologies Inc. based in Torrance, California, and comes just over a year after NASA awarded Canoo the contract to provide the new vehicles, and almost two years since NASA put out a call for proposals.

July 21, 2023July 21, 2023 by Carolyn Collins Petersen

Record-Breaking Magnetar was There in the Data All Along

An artist’s impression of the ultra-long period magnetar—a rare type of star with extremely strong magnetic fields that can produce powerful bursts of energy. Credit: ICRAR

The cosmic zoo has strange beasts that astronomers stumble across in the most fascinating ways. Not long ago a team in Australia found a highly unusual magnetar, one of the weirder denizens of the starry zoo. It’s called GPM J1839-10 and it lies some 15,000 light-years away in the direction of the constellation Scutum.

July 21, 2023July 21, 2023 by Evan Gough

Not All Craters are Circular. Sometimes They Look Like This

This unusual looking Martian crater was created when something impacted the planet's surface at an angle. Image Credit: NASA/JPL-Caltech/UArizona

Impact craters are nature’s signature from a more chaotic time in our Solar System’s history. A quick glance at the Moon’s disfigured surface makes that clear. Same with Mars, though a telescope is needed to examine it. Or better yet, an orbital spacecraft with a powerful camera.

The Mars Reconnaissance Orbiter and its HiRISE camera have been examining Mars’ surface for years, cataloguing the planet’s menagerie of impact craters. One of them, recently chosen as the HiRISE Picture of the Day (HIPOD,) looks like a Thunderbird. Or a dinosaur footprint left in the mud.

July 21, 2023July 21, 2023 by Scott Alan Johnston

China is Working on a New Crew Spacecraft to Carry Up to 7 Passengers

China's Next Generation Spacecraft test vehicle after returning from orbit in 2020. China Central Television (CCTV).

China’s next-generation crew capsule was given an updated timeline this week. According to Yang Liwei, deputy chief designer of China’s Human Spaceflight Program, the new capsule will make its first flight in 2027 or 2028. Meeting this timeline will be a key milestone in China’s recently announced plan to land on the Moon by 2030.

July 21, 2023July 21, 2023 by Brian Koberlein

One Side of This White Dwarf is Covered in Hydrogen While the Other Side is Helium.

Illustration of the newly-discovered white dwarf. Credit: K. Miller, Caltech/IPAC

Sunlike stars and those smaller than the Sun end their lives as white dwarfs. Without a continued source of energy from hydrogen fusion, these stars eventually collapse under their own weight. They would continue collapsing were it not for the pressure of electrons. As long as the remaining mass of a star is less than about 1.4 Suns, the electron pressure and gravitational pull will balance each other, creating a white dwarf.