Universe Today

August 2, 2024August 2, 2024 by Nancy Atkinson

The Surface of Dimorphos is Surprisingly New

Simulation of Dimorphos. Credit: University of Michigan/Yun Zhang and Johns Hopkins APL/Olivier Barnouin

When NASA’s DART mission intentionally slammed into Dimorphos in September 2022, the orbit of the moonlet was altered. Researchers have studied the photos and data taken by DART before its impact, learning more about the geology of the Didymos/Dimorphos system. They have now estimated the surface age of both the asteroid and its moon. The asteroid Didymos has a surface age of 12.5 million years, while the moon Dimorphos is only 300,000 years old.

Additionally, the DART researchers concluded both Didymos and Dimorphos are rubble piles, with Dimorphos likely inheriting its boulders from Didymos.

“It’s a pile of gravel and boulders (and some sand/dust) held together by its own gravity, and really not anything else,” said Andy Rivkin, DART investigation team co-lead at the Johns Hopkins Applied Physics Lab (APL), on Bluesky. “There’s really no cohesion between different pieces of gravel or rocks on Dimorphos.”

August 2, 2024August 2, 2024 by Andy Tomaswick

A Tower On The Moon Could Provide Astronauts With Light, Power, and Guidance

Technologies for enabling NASA’s Artemis mission are coming thick and fast, as plenty of problems must be solved before a permanent human presence on the Moon can be established. A novel idea from Honeybee Robotics, one of the most prominent space technology companies now owned by Blue Origin, could solve plenty of them with one piece of infrastructure. The Lunar Utility Navigation with Advanced Remote Sensing and Autonomous Beaming for Energy Redistribution, or LUNARSABER (which must have been named by someone who really likes Star Wars), is a 100m tall pole that can hold one ton of equipment on top of it. It could serve as a central power, communications, and lighting hub of an Artemis base and part of a mesh network with other places of interest on the Lunar surface.

August 2, 2024August 2, 2024 by Evan Gough

Scientists Want to Use the Moon to Safeguard Earth’s Biodiversity

The ESA lunar base, showing its location within the Shackleton Crater at the lunar south pole. New research proposes building a repository at one of the lunar poles to safeguard Earth's biodiversity. Credit: SOM/ESA

There’s something wrong with us.

We’ve risen to prominence on a world that’s positively “rippling with life,” as Carl Sagan described it. The more we study our planet, the more we find life eking out an existence in the most unlikely of places.

Yet we seem destined to drive many species to extinction, even though we see those extinctions coming from miles away.

As an indication of how serious the problem is, one group of researchers suggests we use the Moon—yes, the Moon—as a safe repository for Earth’s biodiversity.

August 1, 2024August 1, 2024 by Evan Gough

How Oumuamua Changes Our Perspective on Galactic Panspermia

Artist’s impression of the first interstellar asteroid/comet, "Oumuamua". This unique object was discovered on 19 October 2017 by the Pan-STARRS 1 telescope in Hawaii. Credit: ESO/M. Kornmesser

Panspermia is an innately attractive idea that’s gained prominence in recent decades. Yet, among working scientists, it gets little attention. There are good reasons for their relative indifference, but certain events spark renewed interest in panspermia, even among scientists.

The appearance of Oumuamua in our Solar System in 2017 was one of them.

August 1, 2024August 1, 2024 by Evan Gough

A New Model Explains How Gas and Ice Giant Planets Can Form Rapidly

Artist's impression of a young star surrounded by a protoplanetary disc made of gas and dust. According to new research, ring-shaped, turbulent disturbances (substructures) in the disk lead to the rapid formation of several gas and ice giants. Credit: LMU / Thomas Zankl, crushed eyes media

The most widely recognized explanation for planet formation is the accretion theory. It states that small particles in a protoplanetary disk accumulate gravitationally and, over time, form larger and larger bodies called planetesimals. Eventually, many planetesimals collide and combine to form even larger bodies. For gas giants, these become the cores that then attract massive amounts of gas over millions of years.

But the accretion theory struggles to explain gas giants that form far from their stars, or the existence of ice giants like Uranus and Neptune.

August 1, 2024August 1, 2024 by Andy Tomaswick

A Unique Combination of Antennas Could Revolutionize Remote Sensing

Bigger antennas are better, at least according to researchers interested in geospatial monitoring. That’s because higher resolution in monitoring applications requires larger apertures. So imagine the excitement in the remote sensing community when a researcher from Leidos, a government consulting firm, developed an idea that dramatically increased the effective aperture size of a remote radio-frequency monitoring system simply by tying a rotating antenna to a flat “sparse” array. That’s exactly what Dr. John Kendra did, and it has garnered him not only two NASA Institute for Advanced Concepts (NIAC) grants to advance the technology but also a prize paper award at a technical conference on remote sensing. In other words, if implemented correctly, the Rotary-Motion Extended Array Synthesis (R-MXAS) technology could be a game changer for remote sensing applications.

July 31, 2024July 31, 2024 by Laurence Tognetti

Why is the Sun’s Corona So Hot? One Hypothesis Down, Many to Go

Illustration of NASA’s Parker Solar Probe flying through a magnetic switchback from the Sun, with scientists still debating the origin of switchbacks within the Sun. (Credit: Adriana Manrique Gutierrez/NASA’s Goddard Space Flight Center)

The temperature of the Sun’s corona is a minimum of 100 times hotter than the Sun’s surface, despite the corona being far less dense and extending millions of miles from the Sun’s surface, as well. But why is this? Now, a recent study published in The Astrophysical Journal could eliminate a longstanding hypothesis regarding the processes responsible for the corona’s extreme heat, which could help them better understand the Sun’s internal processes. This study holds the potential to help scientists gain greater insight into the formation and evolution of our Sun, which could lead to better understanding stars throughout the universe, as well.

July 31, 2024July 31, 2024 by Matt Williams

A New Study Shows How our Sun Could Permantly Capture Rogue Planets!

This illustration shows a rogue planet traveling through space. Credit: NASA/JPL-Caltech/R. Hurt (Caltech-IPAC)

Interest in interstellar objects (ISOs) was ignited in 2017 when ‘Oumuamua flew through our Solar System and made a flyby of Earth. Roughly two years later, another ISO passed through our Solar System – the interstellar comet 2I/Borisov. These encounters confirmed that ISOs are not only very common, but pass through our Solar System regularly – something that astronomers have suspected for a long time. Even more intriguing is that some of these objects are captured and can still be found orbiting our Sun.

In a recent study, a team of researchers described a region in the Solar System where objects can be permanently captured from interstellar space. Their analysis determined that once objects are captured by our Sun’s gravitational pull and fall into this region—which could include comets, asteroids, and even rogue planets—they will remain in orbit around the Sun and not collide with it. These findings could have drastic implications for ISO studies and proposed missions to rendezvous with some of these objects in the near future.

July 31, 2024July 31, 2024 by Mark Thompson

This Binary Asteroid is Messed Up. It’s Probably Earth’s Fault

Radar images of 1991 VH and its satellite by Arecibo Observatory in 2008

Space is big, really big! Finding new asteroids which are usually dark against the inky blackness of space is harder than looking for a needle in a cosmic haystack. Back in 1991 an astronomer discovered a kilometre wide asteroid which was subsequently found to have a smaller moon half its size. It was given the snappy name of 1991 VH which , after follow up observations was revealed to have a tumbling, chaotic rotation. This was the first binary asteroid that has been seen to exhibit this behaviour. A paper just published suggests that a close encounter with Earth as recently as 12,000 years ago could have started its tumbling motion.

July 31, 2024July 31, 2024 by Mark Thompson

Starliner Successfully Fires its Thrusters, Preparing to Return to Earth

Boeing’s Starliner crew capsule docked to the Harmony module’s forward port at the International Space Station on July 6, 2024. Photo credit: NASA

Being trapped in space sounds like the stuff of nightmares. Astronauts on board the International Space Station have on occasion, had their return delayed by weather or equipment malfunction. We find ourselves again, watching and waiting as two astronauts; Juni Williams and Butch Wilmore have been stuck for months instead of their week long mission. The delays came as the Starliner system required fixes to be implemented. NASA successfully fired up 27 of its 28 thrusters in a hot-firing test and now, ground teams are preparing finally, to bring them home.