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Space
The rings of Chariklo are unexpectedly dynamic and changing
New observations by the James Webb Space Telescope show that the rings of Chariklo, a Centaur in the outer solar system, changed over a period of a few years.
September 16, 2026
Astronomy Essentials
Why is planet Venus so bright in Earth’s sky?
You can't miss dazzling Venus after sunset! It's the 3rd brightest object in the sky, after the sun and moon. But why is Venus so bright?
September 16, 2026
Sun
Sun news: Beautiful prominence, auroras tonight?
Sun news September 16, 2026: The sun stayed quiet, but two CMEs are closing in. Geomagnetic storms and auroras are possible later today.
September 16, 2026
Astronomy Essentials
Tonight
Visible planets and night sky guide for September
Visible planets and night sky guide: Join today's livestream at noon CDT (17 UTC) and find out about the upcoming September equinox.
September 16, 2026
Space
Did Venus have a moon for nearly 2 billion years?
Venus had a moon a long time ago, scientists in the US and France say. It likely survived for nearly 2 billion years until Venus' gravity tore it apart.
September 15, 2026
Space
Mercury is shrinking up to 30% more than expected
A new study shows Mercury is shrinking more than scientists first thought. They say the planet might have already shrunk up to 30% more than expected.
September 15, 2026
Astronomy Essentials
Venus brightest in the evening sky this week
See Venus brightest in the evening sky this week, with greatest brilliancy coming around September 18, 2026. Look west after sunset.
September 13, 2026
Space
Alien tech on the moon? Scientists propose search for microscopic debris
Could there be alien tech on the moon? Scientists propose a new search for microscopic particles shed by alien technology.
September 13, 2026
Astronomy Essentials
See Venus in the daytime: Here are 3 tips
You can spot Venus in the daytime. One of the best ways is when its near the moon. Here are 3 tips to help you spot the brilliant planet Venus in daylight.
September 13, 2026
Earth
Crepuscular rays are sunrays in twilight skies
Crepuscular rays form around twilight when particles in the atmosphere reflect the sun's light beams toward our eyes. See photos of the phenomenon here.
September 13, 2026
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