61–80 of 5,486 results
big, bright, bluish star surrounded by a disk and near a second big, bright bluish star

Stellar Science

“Closest Black Hole” Doesn’t Exist, After All

Astronomers combined forces to confirm that a black hole proposed to lie a mere 1,000 light-years away isn’t really there.

Shackleton Crater

Celestial Objects to Observe

Meet Shackleton Crater: Future Moon Landing Site

Shackleton Crater at the lunar south pole is a site of future exploration — and you can even see it through your telescope during favorable librations.

Full moon and Earth shadow

Explore the Night with Bob King

Uncovering Secrets of Earth's Shadow

The daily rising and setting of Earth's shadow is a beautiful sight anyone on the planet can view. It's also an opportunity to witness the rapid changes that accompany sunset or sunrise, but at the opposite end of the sky.

Spiral galaxy NGC 1097, close-up on central region


Magnetic "Spoon" Feeds Supermassive Black Hole

Astronomers have imaged the magnetic field along which gas flows to a galaxy's central black hole.

Moon-Venus-Mars-Saturn March 27-28

Sky Tour Astronomy Podcast

March: Sirius in the Spotlight

Whether you’re just getting started in astronomy or simply looking to do some casual sky-watching, our monthly Sky Tour astronomy podcast provides an informative and entertaining 12-minute guided tour of the nighttime sky. Download the March episode to find and learn about Sirius, the brightest star in the night sky.

First Stars (art)


No Signal from Cosmic Dawn

Four years after one experiment found tentative signs of the "cosmic dawn," the era of the first stars, another experiment finds nothing.

Supermassive black hole binary animation

Black Holes

These Two Black Hole Behemoths Will Merge in 10,000 Years

Astronomers have discovered a pair of supermassive black holes that whirl around each other every two years.

Moon, Venus, Mars at dawn, Feb. 26-27, 2022

Celestial News & Events

This Week's Sky at a Glance, February 25 – March 5

As the winter Milky Way rides high, open star clusters near and far, and from compact to sparse, await your binoculars or telescope, At dawn catch the Venus-Mars pair, and try for the closer Mercury-Saturn pair lower down.

a large flat purple and gold disc in front of an orange orb on a black background

Black Holes

Black Hole Spins Crookedly

Astronomers have found a black hole leaning decidedly askew in its orbit with a star.

Globular cluster outside M81

Stellar Science

Fast Radio Burst's Unlikely Home Puzzles Astronomers

Astronomers have found a fast radio burst — presumably a flash from a young stellar remnant — amongst the ancient stars of a globular cluster, challenging ideas about what produces these enigmatic flashes.

WISPR view vs. Magellan radar

Solar System

The Parker Solar Probe Captures Surprising Images of Venus Nightside

A visible glow from our sister planet’s nightside sheds new light on a 300-year-old observing enigma dubbed the “ashen light.”

Stellar Science

Protostar Companions in Orion

How are stars born? One of the best places to test ideas about stellar birth is in Orion.

Venus, Mars, Mercury at dawn, Feb. 19, 2022

This Week's Sky At a Glance

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

With the Moon gone from the evening sky, trace out Monoceros the Unicorn walking behind Orion. Spot the famous binocular star clusters at his eye and horn-tip, and don't miss M41 under Sirius. Meanwhile, the waning Moon, passes Venus, Mars and Mercury at dawn.

Artist's impression of AGN


Supermassive Black Hole Hides Behind a Ring of Dust

A high-resolution infrared image has revealed a dust screen obscuring a gas-devouring supermassive black hole in the center of the galaxy NGC 1068, confirming 30-year-old predictions.

Southern Milky Way gazing

Explore the Night with Bob King

Reveling in the Winter Milky Way

With the Moon departing the evening sky, now's a good time for a closer look at the northern winter Milky Way and its southern summer counterpart, too. No equipment required!

Lunar impact site on the Moon's farside

Astronomy in Space with David Dickinson

Booster Set to Hit the Moon Turns Out to be Chinese Rocket (Updates)

The booster previously identified as SpaceX hardware turns out to be from the Chang’e 5-T1 mission. The timing and site of the impact remain the same.

Dark matter-less galaxy


How Galaxies Lose Their Dark Matter

A careful study of cosmological simulations shows that dark matter–less galaxies aren't impossible — just really rare.

Moon crossing Gemini, Feb 12-13, 2022

Celestial News & Events

This Week's Sky at a Glance, February 11 – 19

The Winter Hexagon hosts the Moon. Then Castor and Pollux nail the Moon. Then the Little and Big Dog stars arc gracefully away from it. Meanwhile in early dawn, Mercury, Venus and Mars continue as a triangle low in the southeast.

solar flare

Solar System

Solar Tsunami Hit Earth 9,200 Years Ago

Scientists examining ancient ice cores have found radioactive evidence of an extreme solar storm that took place in 7,176 BCE.


Spacecraft and Space Missions

Space Storm Knocks Out Latest Batch of Starlink Satellites

A minor space storm took down much of the latest Starlink batch shortly after launch.