Sun
Sun news: Activity dips, but sunspot regions look potent
Sun news for April 28, 2026: Activity dips to C-class (common) flares only, but AR4420 and AR4425 stay promising with high-potential magnetic setups.
Astronomy Essentials
Tonight
Visible planets and night sky guide for April and May
Visible planets and night sky guide. This evening, look for the moon near Spica, the brightest star in Virgo. The moon is waxing toward full this week.
Earth
Human World

Save the Frogs Day is today, Tuesday, April 28

Save the Frogs Day - a global amphibian conservation effort - is today, Tuesday, April 28, 2026. Amphibian health is an important marker of ecosystem quality.
Earth

The biggest US supervolcanoes you’ve never heard of

Two of the biggest US supervolcanoes erupted millions of years ago, and you’ve probably never heard of them: Wah Wah Springs and La Garita.
Space

Jan Oort birthday and discovery of the Oort Cloud

Dutch astronomer Jan Oort was born on April 28, 1900. He visualized a vast reservoir of icy comets on the fringes of our Solar System, which now bears his name.
Earth

Severe weather outbreak today for Midwest

See the areas under threat of severe weather Monday here. Stay up to date with your local forecast and have multiple ways to receive vital weather warnings.
Earth

A disabled parrot becomes the alpha male of his group

Bruce the disabled parrot has risen to alpha status among his peers. Bruce does not have an upper beak, yet he excels with a unique beak-jousting tactic.
Space

Interstellar comet 3I/ATLAS born in a cold environment

The chemistry of water in interstellar comet 3I/ATLAS indicates that its home star formed in colder conditions compared to that of our sun.
Space

New organics on Mars raise questions about life

NASA's Curiosity rover has identified the most diverse collection of organics on Mars ever found. They include some organics never seen before.
Sun

Slow solar wind is oddly fast, says Proba-3

Early data from the Proba-3 spacecraft has revealed that slow solar wind travels much faster than expected in the sun's inner corona.

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