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Halloween is an astronomy holiday. It’s a cross-quarter day
A cross-quarter day falls between an equinox and a solstice. Halloween is the year's 4th cross-quarter day and the spookiest of them all.
October 31, 2025
Double stars: How to find, observe and enjoy them
This observing guide gives you a range of choices for seeing double stars with your eyes alone, with binoculars or with a telescope. And some are easy to find.
October 26, 2025
Proxima Centauri, the closest star to our sun
Proxima Centauri is the nearest star to our sun at 4.22 light-years away. It's home to at least 3 planets and has massive solar flares.
October 22, 2025
Comet Halley is the parent of 2 meteor showers
The famous comet Halley spawns both the October Orionid meteor shower and the May Eta Aquariid meteor shower. It'll return to the inner solar system in 2061.
October 17, 2025
The Super Harvest Moon overnight on October 6-7
In 2025, look for the October full moon - the Harvest Moon - on October 6. It's the first of four supermoons in a row.
October 5, 2025
Exoplanets are worlds orbiting other stars
Exoplanets are worlds orbiting distant stars. Watch a video with an astronomer who studies them. Learn the history of our knowledge of exoplanets, and more.
October 1, 2025
The Big Dipper: Why can’t you see it now?
The Big Dipper is easy to recognize at most times of the year. But the Big Dipper in autumn rides low in the northern sky in the evening hours.
September 26, 2025
Deep partial solar eclipse today. Watch live here
A deep partial solar eclipse will occur on September 21, 2025. The path sweeps across the South Pacific including New Zealand and parts of Antarctica.
September 20, 2025
Total lunar eclipse of the full Corn Moon September 7, 2025
Overnight on September 7, 2025, there will be a total lunar eclipse of the September full Corn Moon visible from the Eastern Hemisphere.
September 6, 2025
See the Trifid nebula aka Messier 20 tonight
If you have a dark sky, you can spot the Trifid nebula as a fuzzy patch within the Milky Way. And binoculars or a telescope will reveal more details.
August 28, 2025
