Scientists are considering whether the mysterious “force” accelerating the universe’s expansion changes with time.
We've curated a selection of some of the best pictures our readers submitted to our online gallery of the August 21 solar eclipse.
On August 21, 2017, a total solar eclipse cast its shadow across the US. Sky & Telescope was there, and we captured some of your eclipse reactions.
In addition to clogged roads and crowded hotels, the 2017 solar eclipse had another big effect on U.S. infrastructure: reduced solar power production.
Some academic and citizen-science groups came up with neat initiatives for eclipse day. Let’s find out how they did.
With our editors and writers scattered across the eclipse path today, here are our stories on the total solar eclipse.
Did you see it? Millions of viewers stood in the path of totality yesterday, as the shadow of the the Moon rolled over the United States from coast to coast for the first time in nearly a century. And while eclipse pilgrims were thrilled with an amazing view, millions more turned newly purchased solar viewing…
The Great American Eclipse may be over, but there are some exciting places around the globe getting ready for their own dances with darkness.
With the eclipse just a few days away on Monday, now is the time to start taking stock of the weather forecast — and making decisions.
Multiple organizations are live-streaming the total solar eclipse from groundbased telescopes, racing Volvos, and high-altitude balloons — take a look!
A peculiar white dwarf could be what’s left after a failed supernova explosion.
Enrich the eclipse experience — especially the long, partial phases — with solar eclipse activities for kids and families.
Updated 8/16 to include Predictive Science, Inc.'s predictions. The total solar eclipse is less than three weeks away, but researchers already have a good indication of how the Sun’s corona will look when it comes into view.
Total eclipses have the power to touch us deeply and reverberate through our life in unexpected ways.
Barely visible water-ice clouds coast across Mars’s skies in new videos from the Curiosity rover.
Astronomers have used an innovative technique to discover four super-Earth-size planet candidates orbiting Tau Ceti, a Sun-like star 12 light-years away.
Astronomers have found one of the best exomoon candidates in data collected by the Kepler spacecraft.
A new study suggests that the seven-planet dwarf star could be much older than the Sun.
Totality watchers get the best show, but a far greater number of people will be in partial eclipse territory. Here's how to make the most of it.
Want to know when the eclipse begins and ends in your hometown, or what's the quickest way to the path of totality? Looking for an eclipse countdown timer? There are eclipse apps for that!
A huge, white storm is raging on Neptune, and its location is baffling astronomers. How can a storm system this large exist at the planet's equator?
Matching theory to observation often requires creative detective work. In a new study, scientists have used a clever test to reveal clues about the birth of speedy, Earth-sized planets.
We've gathered some of the best pictures of past solar eclipses, total and partial, from our online photo gallery to serve as inspiration for your eclipse photography
A new study finds that rogue planets — those floating free in the galaxy, unbound to any star — are not as plentiful as we once thought.
Two studies of distant galaxy clusters point to different mechanisms of stopping the baby boom that reigned in the early universe.