Universe Today

July 24, 2024July 24, 2024 by Evan Gough

The Shelf Life of Many Medications Is Shorter Than A Round Trip To Mars

Color mosaic image of Mars, taken by the HRSC instrument aboard the ESA's Mars Express orbiter. Credit: ESA/DLR/FU Berlin (G. Michael)

Check any container of over-the-counter medicine, and you’ll see its expiration date. Prescription medicines have similar lifetimes, and we’re told to discard old medications rather than hold on to them. Most of them lose their effectiveness over time, and some can even become toxic. We’re discouraged from disposing of them in our wastewater because they can find their way into other organisms, sometimes with deleterious effects.

We can replace them relatively easily on Earth, but not on a space mission beyond Low Earth Orbit.

July 24, 2024July 24, 2024 by Evan Gough

Astronomers Have Tools That Can Help Detect Deepfake Images

This AI-generated image of the Pope in a puffer jacket went viral in 2023 and many were fooled into thinking it was real. It was generated with the AI tool Midjourney and was posted on Reddit by a user whose account is now gone. On the right is a Hubble Space Telescope image of the Antennae Galaxies. Image Credit: Midjourney/NASA/ESA

There’s a burgeoning arms race between Artificial Intelligence (AI) deepfake images and the methods used to detect them. The latest advancement on the detection side comes from astronomy. The intricate methods used to dissect and understand light in astronomical images can be brought to bear on deepfakes.

July 24, 2024July 24, 2024 by Andy Tomaswick

A Pair of CubeSats Using Ground Penetrating Radar Could Map The Interior of Near Earth Asteroids

This illustration shows the ESA's Hera spacecraft and its two CubeSats at the binary asteroid Didymos. Image Credit: ESA

Characterizing near-Earths asteroids (NEAs) is critical if we hope to eventually stop one from hitting us. But so far, missions to do so have been expensive, which is never good for space exploration. So a team led by Patrick Bambach of the Max Planck Institute for Solar System Research in Germany developed a mission concept that utilizes a relatively inexpensive 6U CubeSat (or, more accurately, two of them) to characterize the interior of NEAs that would cost only a fraction of the price of previous missions.

July 23, 2024July 23, 2024 by Mark Thompson

New Horizons Measures the Background Light of the Universe

The locations of the NCOB, DCAL, SCAL, and IPD fields are shown on the IRIS full-sky 100 µm map in Galactic coordinates.

Think about background radiation and most people immediately think of the cosmic background radiation and stories of pigeon excrement during its discovery. That’s for another day though. Turns out that the universe has several background radiations, such as infrared and even gravitational wave backgrounds. NASA’s New Horizons is far enough out of the Solar System now that it’s in the perfect place to measure the cosmic optical background (COB). Most of this light comes from the stars in galaxies, but astronomers have always wondered if there are other sources of light filling our night sky. New Horizons has an answer. No!

July 23, 2024July 23, 2024 by Mark Thompson

Next Generation Event Horizon Telescope To Unlock Mysteries of Black Holes

Impact of scattering on the observed polarimetric spiral phase from one 345 GHz frame of the GRMHD simulation of Sgr A*

The prospect of actually resolving the event horizon of black holes feels like the stuff of science fiction yet it is a reality. Already the Event Horizon Telescope (EHT) has resolved the horizon of the black holes at the centre of the Milky Way and M87. A team of astronomers are now looking to the next generation of the EHT which will work at multiple frequencies with more telescopes than EHT. A new paper suggests it may even be possible to capture the ring where light goes into orbit around the black hole at the centre of the Milky Way.

July 23, 2024July 23, 2024 by Matt Williams

The Ultraviolet Habitable Zone Sets a Time Limit on the Formation of Life

Artist's impression of the range of habitable zones for different types of stars. Credit: NASA/Kepler Mission/Dana Berry

The field of extrasolar planet studies has grown exponentially in the past twenty years. Thanks to missions like Kepler, the Transiting Exoplanet Survey Satellite (TESS), and other dedicated observatories, astronomers have confirmed 5,690 exoplanets in 4,243 star systems. With so many planets and systems available for study, scientists have been forced to reconsider many previously-held notions about planet formation and evolution and what conditions are necessary for life. In the latter case, scientists have been rethinking the concept of the Circumsolar Habitable Zone (CHZ).

By definition, a CHZ is the region around a star where an orbiting planet would be warm enough to maintain liquid water on its surface. As stars evolve with time, their radiance and heat will increase or decrease depending on their mass, altering the boundaries of the CHZ. In a recent study, a team of astronomers from the Italian National Institute of Astrophysics (INAF) considered how the evolution of stars affects their ultraviolet emissions. Since UV light seems important for the emergence of life as we know it, they considered how the evolution of a star’s Ultraviolet Habitable Zone (UHZ) and its CHZ could be intertwined.

July 23, 2024July 23, 2024 by Carolyn Collins Petersen

Curiosity Drives Over a Rock, Cracking it Open and Revealing an Amazing Yellow Crystal

The Mars Curiosity rover rolled over this rock containing pure sulfur crystals in May. Planetary scientists are still trying to figure out how the sulfur got there. NASA/JPL-Caltech/MSSS

On May 30th, the Mars Curiosity rover was just minding its own business exploring Gediz Vallis when it ran over a rock. Its wheel cracked the rock and voila! Pure elemental sulfur spilled out. The rover took a picture of the broken rock about a week later, marking the first time sulfur has been found in a pure form on Mars.

July 23, 2024July 23, 2024 by Andy Tomaswick

Producing Oxygen From Rock Is Harder In Lower Gravities

One of the challenges engineers face when developing technologies for use in space is that of different gravities. Mostly, engineers only have access to test beds that reflect either Earth’s normal gravity or, if they’re fortunate, the microgravity of the ISS. Designing and testing systems for the reduced, but not negligible, gravity on the Moon and Mars is much more difficult. But for some systems, it is essential. One such system is electrolysis, the process by which explorers will make oxygen for astronauts to breathe on a permanent Moon or Mars base, as well as critical ingredients like hydrogen for rocket fuel. To help steer the development of systems that will work in those conditions, a team of researchers led by computational physicist Dr. Paul Burke of the Johns Hopkins University Applied Physics Laboratory decided to turn to a favorite tool of scientists everywhere: models.

July 23, 2024July 26, 2024 by David Dickinson

Astro-Challenge: Catching Pluto at Opposition 2024

Why July 2024 is a prime time to see distant Pluto before it fades from view.

Lots of the ‘wow factor’ in astronomy revolves around knowing just what you’re seeing. Sure, a quasar might be a faint +14^th magnitude point of light seen at the eyepiece, but it’s also a powerful energy source from the ancient Universe, billions of light-years distant.

The same case is true for finding Pluto. Though its 0.1” disc won’t resolve into anything more than a speck in even the most powerful backyard telescope, knowing just what you’re seeing is part of the thrill of finding the distant world.

July 23, 2024July 23, 2024 by Mark Thompson

The Entrance of a Lunar Lava Tube Mapped from Space

Craters are a familiar sight on the lunar surface and indeed on many of the rocky planets in the Solar System. There are other circular features that are picked up on images from orbiters but these pits are thought to be the collapsed roofs of lava tubes. A team of researchers have mapped one of these tubes using radar reflection and created the first 3D map of the tube’s entrance. Places like these could make ideal places to setup research stations, protected from the harsh environment of an alien world.