21–40 of 5,204 results

Exoplanets

NASA’s Kepler Finds Outcast Earths

Astronomers uncovered four new Earth-mass rogue planet candidates by searching for microlensing events observed with Kepler.

The crescent Moon passes Venus and Mars in conjunction, July 11-12, 2021

This Week's Sky At a Glance

This Week's Sky at a Glance, July 9 – 17

Bright Venus and tiny Mars come to conjunction low in the western twilight, as the crescent Moon stands watch. On the other side of the sky, Saturn and Jupiter rise after dark. And before moonlight comes back, delve the deep sky in Scorpius and Sagittarius.

EnVision

Solar System

What Will ESA's EnVision Learn at Venus?

ESA's EnVision mission to Venus adds to the growing number of spacecraft investigating our sister planet. How will they work together to understand our sister planet'?

Jupiter, Ganymede, Europa and double shadows, March 25, 2019

Solar System

Amateur Astronomer Discovers New Moon of Jupiter

An amateur astronomer has discovered a new moon of Jupiter. While it hasn't received official designation yet, it would bring the tally of Jovian satellites to 80.

Solar System

NASA’s Curiosity Takes Step Toward Solving Mars Methane Mystery

New measurements from NASA’s Curiosity rover show that methane concentrations near the Martian surface vary on a daily cycle. The finding could help reconcile conflicting data.

Solar System

More Mysterious Buried Splotches on Mars Might Not be Liquid Water

Astronomers find more bright spots underneath Mars's south polar cap, but could they really be subterranean lakes?

Moon between Pleiades and Aldebaran, dawn July 6, 2021

This Week's Sky At a Glance

This Week's Sky at a Glance, July 2 – 10

Bright Venus and faint little Mars close in on each other low in the western twilight. Scorpius, laden with interesting stars and deep-sky targets, is highest in the south right after dark. Sagittarius, even richer, follows behind. Saturn and Jupiter rise in late evening.

blue noctilucent clouds hover over trees and a pink sunset

Celestial News & Events

Noctilucent Cloud Show, a Mercurial Nova, and More

Summer only lasts so long. Like everything, it's transient. That will be our theme as we explore wispy noctilucent clouds, a nova that can't sit still, and a supernova in NGC 5427 in Virgo.

Canyonlands Star Party

People, Places, and Events

Return of the Star Parties

As many states roll back COVID restrictions, stargazers across the continent are excited to meet up with old and new friends at their favorite observing sites.

Moon-Venus-Mars in July 2021

Sky Tour Astronomy Podcast

July: Inner Planets Rule!

True darkness is fleeting in July, especially at higher latitudes. So make the most of the darkness you have, by downloading our narrated Sky Tour podcast to "what's up" in the night sky.

Smallest white dwarf comparison to Moon

Stellar Science

Moon-size White Dwarf Is the Smallest Ever Found

Astronomers have discovered a white dwarf only slightly bigger than the Moon, making it the smallest ever found. It might even be on the edge of collapse.

Black Holes

Gravitational Waves Reveal Black Hole–Neutron Star Mergers

Two new detections give astrophysicists a novel look at how stellar remnants pair up.

Radar view of Venus

Solar System

Venus Surface Is Fragmented Like “Pack Ice”

A new analysis of old data suggests that some of our sister planet’s unique surface formations are due to a “squishy” crust and an active interior.

Galaxies

Galaxies That Evolve Together But Don’t Stay Together

A study of 36 dwarf galaxies within a volume of space spanning 13 million light-years show they all have remarkably similar histories despite the vast distances between them.

Venus and Mars in the west at dusk, late June 2021

This Week's Sky At a Glance

This Week's Sky at a Glance, June 25 – July 3

Showy Venus and shy little Mars draw closer together in the western dusk. In the east, the Summer Triangle holds sway after dark with the Milky Way behind it.

Solar System

Astronomers Map the Solar System's Edge in 3D

Collecting high-speed atoms has enabled researchers to trace the shape of our Sun’s protective bubble.

Orbit of Comet 2014 UN271

Solar System

Giant Oort Cloud Comet Lights Up in the Outer Solar System

Astronomers have discovered a new comet coming from the Oort Cloud — and it appears to be a big one.

Epsilon Aurigae model

Stellar Science

The Giant Star That "Blinked"

Astronomers are trying to understand why a giant star "blinked," fading almost completely before brightening again over the course of about 200 days.

Temple of the Moon

Eclipses

Plan Ahead for the 2023 Annular Solar Eclipse — and a Visit to Dark Sky Parks

If today’s solar eclipse has you wondering when the next one will cross the continent, start planning now for a stellar trip around October 14, 2023.

Venus and Mars in the western twilight, June 21, 2021

This Week's Sky At a Glance

This Week's Sky at a Glance, June 18 – 26

Summer begins. The Honey Moon poses with Spica, Scorpius, and the Teapot as it waxes from gibbous through full this week. Venus lines up, briefly, with Castor and Pollux

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