21–40 of 6,093 results

Stellar Science

What Happens After a Supernova Blows? Watch and Find Out

New time-lapse videos from the Chandra X-ray Observatory show the Crab Nebula and the Cassiopeia A supernova remnant over more than 20 years.

Pluto full disk high resolution

Solar System

A Cosmic Arrow Pierced Pluto's Heart — Is It Still There Beneath the Surface?

A giant impact likely formed Pluto's heart-shaped basin, Sputnik Planitia. A big chunk of the impactor’s core might still be buried under the ice.

Mars and Saturn low in the dawn around April 27, 2024

Celestial News & Events

This Week's Sky at a Glance, April 26 – May 5

All the planets now huddle around our line of sight toward the Sun. However, these moonless evenings present us the Spring Triangle, the Great Diamond with a sugar sprinkle on its edge, and the Pointers aligned vertically.


Solar System

Earth’s Mini-Moon Linked to Farside Lunar Crater

Researchers might have located the birthplace of 469219 Kamo‘oalewa, a small asteroid that has been described as Earth’s “mini-moon.”

NGC 2547 open star cluster

Southern Stargazing with Jonathan Nally

Sail into the Southern Skies with Vela

The large constellation Vela contains many hidden treasures.

Mimas appears like the Death Star

Solar System

How Saturn’s Moon Mimas Might Have Melted

Maybe everything in the outer solar system is an ocean world.

Jupiter and GRS

Solar System

Meteorites Tighten Timeline for Giant Planets’ Movement through the Solar System

By linking a family of meteorites on Earth to their relatives in the asteroid belt, scientists have arrived at a new understanding of the giant planets' movement early in the solar system's history.

People, Places, and Events

Sky & Telescope Joins the Northeast Astronomy Forum

Sky & Telescope met with readers old and new at the annual Northeast Astronomy Forum.

black hole surrounded by a glowing orange ring

Black Holes

Watch a Hotspot Orbit Our Galaxy's Black Hole

Astronomers have reconstructed a 3D video of hot gas orbiting a stone’s throw away from our galaxy’s central black hole.

Moon meets Spica as Corvus watches, April 22, 2024

This Week's Sky At a Glance

This Week's Sky at a Glance, April 19 – 28

Springtime Leo walks high in the south, springtime Hydra snakes a quarter of the way around the celestial sphere, and the bright Moon aligns with Spica.

ISS Eclipse

Astronomy in Space with David Dickinson

See Amazing Views of the April 8th Total Solar Eclipse from Space

Millions of viewers were wowed by last week’s total solar eclipse. Now, we get to see the eclipse from another angle: space.

Sungazing comet caught in widefield photo of total solar eclipse

Solar System

Amateur Astronomers Caught Sungrazing Comet during Solar Eclipse

Wide-field photos of the total solar eclipse taken by several astronomers along the path of totality, caught a comet approaching the Sun.

Jupiter Uranus 12P comet

Explore the Night with Bob King

Jupiter Meets Uranus in Twilight; Supernova Erupts in Nearby Spiral Galaxy

Jupiter aligns with distant Uranus before it exits the evening sky as a bright supernova flares in the southern galaxy NGC 3621.

Perseverance selfie at Rochette rock on crater floor

Space Missions

NASA Struggles to Find Way Forward for Mars Sample Return

NASA's Perseverance mission has been collecting samples for later retrieval and return to Earth. Now, it's unclear how we'll get those samples home.

bright blue pair of stars surrounded by a dumbbell-shaped cloud of gas and dust

Stellar Science

See What Happens When Stars Collide

A star in the constellation Norma appears to have been created when two stars merged.

Mars and Saturn very low in the dawn, April 13, 2024

Celestial News & Events

This Week's Sky at a Glance, April 12 – 21

Jupiter is easy to spot, shining low in the west at nightfall. Near it are Uranus and Comet Pons-Brooks, tougher catches that require binoculars or a wide-field telescope — and some finding skills.

cartoon showing different types of exoplanets


The Planet K2-18b May Not Be Habitable After All

New research suggests Exoplanet K2-18b may actually be a gas-rich planet with no habitable surface instead of a habitable water world.

Map of the 2026 total solar eclipse

Astronomy & Observing News

Plan Now for the 2026 Total Solar Eclipse in Europe

On August 12, 2026, a total solar eclipse will be visible across Greenland, Iceland, and Spain, with plenty of inspiring itineraries.

Astronomy and Society

The Totality Experience: S&T’s Eclipse Stories

With Sky & Telescope’s editors and writers scattered across the eclipse path, we have dozens of stories to share. Here are a few.

Total Solar Eclipse Madras, Oregon

Celestial News & Events

11 Things to Take With You the Day of the Solar Eclipse

You might have your eclipse-viewing plans all worked out, but have you thought about all the other things you might need?