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Space
Edwin Hubble born today and the expanding universe
In 2018, the International Astronomical Union voted to rename Hubble's law as the Hubble–Lemaître law to share credit between Edwin Hubble and Georges Lemaître.
November 20, 2025
Earth
Sun
Sun news: Huge eruptions from the far side of our star!
Sun news November 20, 2025: A quiet sun on our side, but massive far-side eruptions lit up the solar poles, blasting plasma into space.
Space
NASA shared new pics of interstellar object Comet 3I/ATLAS
NASA revealed new images of interstellar object Comet 3I/ATLAS on November 19, 2025. These images are from multiple missions. See them here!
November 20, 2025
Space
Exoplanet atmospheres are a key to habitability
The habitable zone of a planet might be key to whether life can survive there. But so are exoplanet atmospheres, scientists say.
November 20, 2025
Astronomy Essentials
Tonight
Visible planets and night sky guide for November
Visible planets and night sky guide. Look for Jupiter and Saturn in the late November evening sky. Coming soon: the crescent moon in the west after sunset.
November 20, 2025
Space
Lost sisters of the Pleiades are scattered across the sky
Astronomers have discovered that the Pleiades star cluster has more than 3,000 sibling stars that originated from the same giant molecular cloud.
November 19, 2025
Astronomy Essentials
What’s a red dwarf? Only the most abundant Milky Way star
A red dwarf star is the smallest and coolest type of star known. They're also extremely common, making up around 75% of the stars in the Milky Way.
November 19, 2025
Space
Was NASA’s ‘no life on Mars’ conclusion in the 70s wrong?
In the late 1970s, NASA declared 'no life on Mars' when the Viking landers failed to find organic molecules (but they did). So was that conclusion a mistake?
November 18, 2025
Astronomy Essentials
Uranus at opposition on November 21, 2025
Uranus reaches opposition on November 21. At this time, it's brightest for the year and visible to the eye under optimum observing conditions.
November 18, 2025
Brightest Stars
Meet Hamal, an ancient equinox star, in Aries the Ram
Meet Hamal, the brightest star in Aries, and learn why people sometimes refer to the March equinox point as the First Point in Aries.
November 18, 2025
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