Space News & Blog Articles

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This Week's Sky at a Glance, December 22 – 31

Christmas week this year puts the late-night Moon at the highest overhead you'll ever see it. High Jupiter lights the evening. Venus is the bright "star" lower in the east at dawn.

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JWST Reveals Distant “Galaxy” Is Six-way Galactic Crash

Peering deep into the past, the James Webb Space Telescope’s keen detectors are revealing unprecedented details of some of the oldest structures in the universe.

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Astronomers Find 100,000-light-year Bow Shock in the Milky Way’s Outskirts

New simulations showed astronomers where to look for evidence of a dwarf galaxy's bow shock as it crashes through the Milky Way's halo.

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As an Asteroid-Hunting Mission Approaches Its End, What's Next?

The pioneering NEOWISE observatory celebrates a milestone, even as the end of the mission draws near.

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This Week's Sky at a Glance, December 15 – 24

The waxing Moon passes Saturn, jumps over Jupiter, then jumps the Pleiades. Sirius and Procyon rise earlier, but the Summer Triangle still hangs on.

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Vesta Sets Sail Across Orion

Look who's visiting this winter in Orion: Vesta, a bright asteroid with a dark side.

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Cassiopeia A: A Festive Supernova Remnant

New near-infrared observations from the Webb telescope reveal intricate strands of debris from the exploded star.

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Buried Polygons on Mars Point to “Stark Environmental Transition”

Polygons buried beneath the surface of Mars indicate an abrupt transition in the planet's early history.

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This Week's Sky at a Glance, December 8 – 17

The best meteor shower of the year peaks late Wednesday night. And if you're not positioned to see the tiny asteroid occult Betelgeuse Monday evening, watch by livestream!

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Dark Halos and Warped Disks

Galaxies are embedded within halos of dark matter, and the tilt of those halos can affect the galaxy's stellar halo and stellar disk.

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The Comet-Asteroid Chiron Has Rings — And They're Changing

A series of stellar occultations has provided evidence that the ring system around this strange object is evolving drastically.

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A Great Year for the Geminids

It’s December and that means one of the best celestial events will grace the skies. The Geminid meteor shower should peak in a moonless sky between Wednesday and Thursday, December 13–14.

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Astronomers Discover 562 New Candidate Strong Lenses With Machine Learning

An international research collaboration trained computers to sift through millions of images for cosmic treasure.

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This Week's Sky at a Glance, December 1 – 9

These moonless evenings open up the deep sky. For many of us the viewing is especially crisp through the low-humidity December air. The Big Dipper lies low, Cassiopeia stands high, and the Andromeda Galaxy crosses the zenith.

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December Podcast: A Tower of Brilliant Stars

This month’s Sky Tour podcast introduces you to a “tower of brilliance” in the eastern evening sky, along with tips for finding four planets and watching mid-December’s impressive Geminid meteor shower.

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Watch Jupiter's Moons in Unusual Lineups

You'll have five opportunities in the coming months to see Jupiter's moons in interesting alignments.

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Do Glaciers on Mercury Suggest Such a Planet Could Be Habitable?

Salt glaciers on Mercury suggest conditions friendly to life — but not life itself — might once have existed on the innermost planet.

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Amateur Astronomers Discover an Asteroid’s Moon

The small object orbiting around main-belt asteroid 5457 Queen’s is the second confirmed asteroid moon discovered during a stellar occultation.

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Get Ready to Greet the Geminid Meteor Shower!

The year's most spectacular meteor shower is upon us. Prepare to enjoy the Geminids under a dark, moonless sky, when you might see more than 100 meteors per hour.

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Six Sub-Neptunes Discovered 100 Light-Years Away

Astronomers have uncovered six sub-Neptune exoplanets dancing in lock-step around the same distant star, shedding light on their formation.

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This Week's Sky at a Glance, November 24 – December 3

This Tuesday the 28th we will see the Moon rise in twilight as far north as it possibly can. Do you know why?

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