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Year’s shortest season to start at December solstice
The year's shortest season - between the December solstice and March equinox - is about 89 days. It's 5 days shorter than the longest season.
December 18, 2025
What’s a green flash and how can I see one?
Have you ever seen the green flash from a setting sun? Learn how to see one here, plus how they appear, and enjoy some great photos and watch a video!
December 18, 2025
December has the longest days (wherever you live)
The longest days accompany the winter solstice. In December, a day - a whole cycle of day and night - is about half a minute longer than the average 24 hours.
December 18, 2025
Weird, ultra-hot, double-tailed planet surprises scientists
WASP-121 b is a scorching double-tailed planet. Helium gas is escaping from its atmosphere and forming 2 huge tails along its orbit.
December 17, 2025
Researchers question methane atmosphere on TRAPPIST-1e
Previous hints of a methane atmosphere on TRAPPIST-1e might not be accurate, a new paper suggests. But the tantalizing exoplanet could still have an atmosphere.
December 17, 2025
Look for Cetus the Whale swimming in a celestial sea
Cetus the Whale is a huge constellation that swims in a sea of stars near constellations named for a river and fish. And it contains a wonderful variable star.
December 17, 2025
The Wright brothers succeeded 122 years ago
The Wright brothers made aviation history on December 17, 1903, taking humanity’s 1st powered flight into the skies at Kitty Hawk.
December 17, 2025
Astronomers create 1st map of the sun’s outer boundary
Astronomers have produced the 1st map of the sun's outer boundary, the point-of-no-return for material that escapes the sun's magnetic grasp.
December 16, 2025
Astronomers see monster stars from the cosmic dawn
Researchers have found evidence for monster stars in the early universe. These giants collapsed directly into the earliest supermassive black holes.
December 16, 2025
The Andromeda Galaxy: All you need to know
The Andromeda Galaxy is the closest large galaxy to our Milky Way. At 2.5 million light-years, it's the most distant thing you can see with the eye alone.
December 16, 2025
