41–60 of 5,397 results
Concept of the universe's expansion

Cosmology

No Release for the Hubble Tension

New data and analysis show that a long-standing discrepancy in the measurement of the current expansion rate of the universe is real — even as the reason for it remains a mystery.

Compact object emits jets and ring of light in artist's concept of a supernova dubbed

Black Holes

Stellar Remnant at the Core of Mysterious Flash Dubbed "The Cow"

Astronomers have identified the origin of a mysterious flash that occurred three years ago.

Celestial News & Events

Precious Hours with the Geminids

At first glance, the annual Geminid meteor shower appears to be on a collision course with a bright Moon. But a closer look reveals a happy window of dark skies.

Moon padding Pleiades and Aldebaran, Dec. 16-17, 2021

This Week's Sky At a Glance

This Week's Sky at a Glance, December 10 – 18

Comet Leonard switches from low in the dawn to low in the dusk this week; you'll need those binocs. The Venus-Saturn-Jupiter line slides westward. And the high full moon of December rides across the sky in Taurus, at the top of the ecliptic.

a solar eclipse above a cloud bank with a dark blue sky turning orange towards the horizon

Eclipses

Total Solar Eclipse: Reports from Antarctica

Sky & Telescope and friends report on the total solar eclipse that occurred over Antarctica earlier this week.

IXPE Launch

Spacecraft and Space Missions

NASA Launches New X-ray Explorer

The Imaging X-ray Polarimetry Explorer will shed new light on energetic and enigmatic sources such as magnetars, supernovae, and black holes.

Artist's concept of giant planet in a far-out orbit

Exoplanets

Giant Planet Imaged Around Massive Stars

Astronomers have imaged a giant planet around a massive pair of stars, a discovery that challenges our notions of how planets form.

Leo I dwarf galaxy

Milky Way

Tiny Galaxy’s Giant Black Hole Throws Astronomers for a Loop

A satellite galaxy dwarfed by the Milky Way has a black hole nearly as massive as the one at the center of our galaxy.

Five cluster collisions show how the shapes evolve from bullet to cone to curled tongue

Galaxies

Astronomers Find Confounding Cone Shape in Cluster Collision

Galaxy clusters take eons to collide. Now, astronomers have caught a pair of merging clusters in an in-between stage never seen before.

ISS

Spacecraft and Space Missions

What's Next After the International Space Station?

NASA will end support for the International Space Station by 2030, transitioning low-Earth orbit to commercial operations.

Magellanic Clouds

Galaxies

How Our Largest Dwarf Galaxy Keeps the Others In Line

New research may explain why satellite galaxies align themselves around the Milky Way

Comet Leonard meets M3

Explore the Night with Bob King

See Comet Leonard at its Best

The year's brightest comet is now on display in the predawn sky this week and next. Here's how to find it.

Crescent Moon and Venus at dusk, Dec. 6-7, 2021

Celestial News & Events

This Week's Sky at a Glance, December 3 – 11

The crescent Moon at dusk hangs under Venus, then Saturn, then Jupiter. Comet Leonard is at its best before dawn. And welcome in, Orion!

Image of two bright galaxy cores

Black Holes

Nearest Supermassive Black Hole Pair Discovered

Astronomers have observed a pair of supermassive black holes set to collide in 250 million years.

Auriga Taurus Gemini and Orion

Sky Tour Astronomy Podcast

December: Geminid Meteors & Comet Leonard

December’s solstice brings the longest northern nights, and it’s a busy month for stargazers: the Geminid meteors, a visit from Comet Leonard, and a plethora of bright stars and constellations.

Proxima Centauri flare

Celestial Objects to Observe

Meet Proxima Centauri: The Closest Star

Proxima Centauri is the dimmest and smallest of the Alpha Centauri system, but it has the honor of being the nearest star.

Stellar-mass black hole with accretion disk and jet

Black Holes

Astronomers Watch Black Hole Jet Launch

Astronomers have watched a jet launch from a stellar-mass black hole, shedding light on how these structures form.

Moon crossing Leo at dawn, Nov. 26-28, 2021

This Week's Sky At a Glance

This Week's Sky at a Glance, November 25 – December 4

While the Jupiter-Saturn-Venus line keeps shrinking, all kinds of deep-sky sights, naked-eye to telescopic, show themselves on these moonless evenings.

NASA's DART mission

Solar System

NASA’s DART Mission Launches for Head-on Collision with an Asteroid

The first-ever planetary defense mission is now on its way to the asteroid Didymos and its moon, Dimorphos.

Galaxies in Cetus

Celestial Objects to Observe

Deep-sky Fishing in Cetus, the Whale

Small telescopes can reel in some big ones in the constellation Cetus, the Whale.

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