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November birthstone: Choose either topaz or citrine
The November birthstone, topaz, comes in lots of colors. It's a much-loved gemstone in jewelry, with myths that date to ancient times. Or choose citrine.
November 2, 2025
The year’s earliest solar noon is on November 3
November 3 brings the year's earliest solar noon - that is, earliest midday - by nature's clock. It's a harbinger of the Northern Hemisphere's earliest sunset.
November 2, 2025
Sun activity archive for November 2025
Sun activity archive for November 2025. A daily record of flaring, big filaments and prominences, and other sorts of activity, on our local star.
November 1, 2025
Algol the Demon Star, named for its strange behavior
What's the scariest star in all the heavens? It's Algol the Demon Star, and you can see it on autumn evenings. Click in to learn the secret of Algol's creepiness!
October 31, 2025
Daylight Time ends Sunday: 7 tips to help you adjust
Daylight Time ends on November 2, 2025. Here are 7 tips from the American Academy of Sleep Medicine to help you adjust to the time change.
October 31, 2025
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
Could Taurid fireballs – aka Halloween fireballs – bring a risk to Earth?
Researchers from the University of New Mexico said that the Taurid meteor shower - aka Halloween fireballs - could bring a risk of an airburst in 2032 and 2036.
October 30, 2025
Super-Earth 18 light-years away sparks hope for life in space
Astronomers have found a new super-Earth 18 light-years away. Exoplanet GJ 251 c is both nearby and in the habitable zone of its star.
October 30, 2025
A view of the Milky Way galaxy in unprecedented radio color
Astronomers released a new radio view of our Milky Way galaxy on October 29, 2025. It's the largest low-frequency radio color image of the Milky Way yet.
October 30, 2025
Look for the Witch Head nebula this Halloween night
The Witch Head nebula rises near the star Rigel in Orion on Halloween night, but it's too faint to see without a large telescope. A perfect sight for Halloween.
October 30, 2025
