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Astronomy Essentials
Tonight
Visible planets and night sky guide for July and August
Visible planets and night sky guide. This evening, look for the waxing crescent moon close to Mars as twilight darkens. Watch for them shortly after sunset.
July 28, 2025
Earth
Sun
Sun news: All quiet, but solar wind might pick up
Sun news July 28, 2025. Solar activity and geomagnetic activity are calm for now. More solar wind soon could bring some minor geomagnetic activity and auroras.
Space
Is the 3rd interstellar visitor – 3I/ATLAS – an alien probe?
It's highly unlikely the interstellar comet 3I/ATLAS is an alien spacecraft. However, here are things scientists would look for to detect an alien probe.
July 27, 2025
Space
Extensive ancient rivers on Mars revealed in new study
A new study of data from 2 Mars orbiters shows vast ancient rivers on Mars in the Noachis Terra region. They show Mars was even wetter than we first thought.
July 27, 2025
Earth
What is corn sweat, and is it making the heat worse?
Corn sweat is when corn releases moisture to keep cool, but it makes people sweat as it increases the humidity in the air, making days feel even hotter.
July 27, 2025
Space
Star survives black hole, returns for another round
Astronomers have made the first confirmed detection of a star surviving destruction at the hands of a supermassive black hole. Then it returned for round 2.
July 27, 2025
Human World
Are dogs a good judge of character? New study says maybe not
Many people think their dogs are good judges of a person’s character, but new research indicates there is no evidence that dogs form opinions of people.
July 25, 2025
Tonight
Return of Orion the Hunter, ghost of the summer dawn
Orion the Hunter returns to the east at dawn at this time every year. Here's how to watch for this most noticeable of constellations.
July 25, 2025
Space
Young, massive exoplanet is in an unusual double star system
HD 135344 Ab is a young massive exoplanet orbiting a star in a binary star system 440 light-years away. The other star still has its planet-forming disk.
July 25, 2025
Earth
Millions under extreme heat threat across the U.S.
Millions of people in the United States are at risk for dangerous or extreme heat on Friday, July 25, 2025, and through the weekend.
July 24, 2025
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