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JUICE is planning to do science on Jupiter’s ‘minor’ moons too

The European Space Agency’s (ESA’s) Jupiter Icy Moons Explorer (JUICE) probe is on its (very long) way to Jupiter, and will finally arrive at the King of Planets in 2031. Its primary mission is to focus on the “big three” icy moons—Ganymede, Europa, and Callisto. But while JUICE is busy mapping Ganymede’s magnetic field, it […]

The moon’s going to get crowded. We should protect our heritage on it while we still can

In 1959, the Luna 2 probe from the Soviet Union became the very first human-made object to reach our closest celestial neighbor. In the decades since, we have been leaving footprints—both literally and figuratively—all over the moon. Today, there are over 100 metric tons of human-made material resting on the moon’s surface—everything from advanced cameras […]

DESI maps C-19, an extremely metal-poor Milky Way stellar stream

Using the Mayall 4-meter telescope at Kitt Peak National Observatory, an international team of astronomers has observed C-19—an extremely metal-poor stellar stream in the Milky Way’s halo. Results of the observational campaign, published March 11 on the arXiv pre-print server, provide crucial insights into the properties of this stellar stream.

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The best places to look for alien life: Scientists identify 45 Earth-like worlds to explore for a ‘Project Hail Mary’

If we’re to find extraterrestrial life in the universe, astronomers have pinpointed the best places to look for it. They have identified just under 50 rocky worlds most likely to be habitable out of the more than 6,000 exoplanets discovered so far.

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The discovery of a buried delta on Mars could boost the search for life

There’s more evidence that water once flowed on Mars with the discovery of an ancient river delta deep below the surface. NASA’s Perseverance rover found it more than 35 meters beneath Jezero Crater using ground-penetrating radar. Perseverance was launched in 2020 to search for signs of ancient life on the red planet. Since landing in […]

How two dim stars came together to shine brightly

Brown dwarfs get a bad rap in the stellar world, often labeled as “failed stars” for their inability to sustain nuclear fusion at their cores. The mass of these objects falls between planets and stars, ranging from 13 to 80 times the mass of Jupiter. Because they aren’t massive enough to sustain fusion, they are […]

NASA’s Hubble unexpectedly catches comet breaking up

In a happy twist of fate, NASA’s Hubble Space Telescope witnessed a comet in the act of breaking apart. The chance of that happening while Hubble watched is extraordinarily minuscule. The findings are published in the journal Icarus.

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How common are fireballs streaking across the sky?

The Earth is under assault. Space rocks are constantly hurtling toward us, slamming into the atmosphere and often exploding into fireballs that both delight and alarm.

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Astronomers search for ‘exotrojans’ hiding in extreme pulsar systems

Greek mythology has given a name to a great many objects in our solar system. But perhaps one of the least well understood are the Trojans, named after the people of Troy featured in “The Iliad.” When astronomers refer to them, they are normally talking about a group of more than 10,000 confirmed asteroids orbiting […]

How young galaxies grew magnetic fields faster than expected

How fast can a galaxy build ordered magnetic fields spanning thousands of light-years? Existing theories say several billion years, but observations of galaxies in our universe imply shorter timescales. In a study published in the Physical Review Letters and highlighted in the Physics magazine, scientists propose an explanation that resolves this contradiction. They say that […]

Dim delights in the Cancer constellation

Cancer the Crab is a dim constellation, yet it contains one of the most beautiful and easy-to-spot star clusters in our sky: the Beehive Cluster. Cancer also possesses one of the most studied exoplanets: the superhot super-Earth, 55 Cancri e.

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Colliding dust and the sparks of creation: Carbon-coated grains provide new clue to life’s early energy

Two microscopic grains collide and produce a tiny spark. This phenomenon may have provided the energy to kick off life on Earth. But if these solid particles have the same composition, what factor causes the charge to flow in a given direction? In a study published in Nature, physicists from the Institute of Science and […]

Using fiber-optic cables to detect moonquakes

Two recent studies suggest that fiber-optic cables laid directly on the moon’s surface could potentially detect moonquakes, offering a simpler way to gather seismic data to support future human and robotic exploration.

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Clearest evidence yet that giant planets spin faster than their cosmic lookalikes

For decades, astronomers have struggled to differentiate giant planets from brown dwarfs, a class of objects more massive than planets but too small to ignite nuclear fusion like true stars. Through a telescope, these cosmic lookalikes can have overlapping brightness, temperatures, and even atmospheric fingerprints. The striking similarity leaves astronomers unsure if they have observed […]

From dust to planets: Parabolic flight reveal a turbulent path

How does fine dust aggregate into building blocks that ultimately form entire planets like our Earth? A research team led by the University of Bern, with the participation of ETH Zurich, the University of Zurich and the National Center of Competence in Research (NCCR) PlanetS has provided the first experimental evidence—obtained during parabolic flights in […]