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Astronomy Essentials
Tonight
Visible planets and night sky guide for July and August
Visible planets and night sky guide. Tonight, the thin crescent moon appears low in the west, close to the bright star Regulus. Start watching for meteors!
July 26, 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
Moon Phases
What is a new moon?
The new moon generally can't be seen, except during a solar eclipse. The moon crosses the sky with the sun during the day, and its shadow side is toward Earth.
July 24, 2025
Today's Image
New Chandra images reveal glorious galaxies and more
New Chandra images highlight glittering spectacles of the cosmos, from star factories to black-hole-powered galaxies. See more about them here!
July 24, 2025
Space
‘Unicorn’ long-period radio transient baffles scientists
Astronomers have discovered a long-period radio transient with theory-defying properties. It's incredibly polarized, and its spin appears to be speeding up.
July 24, 2025
Earth
A mysterious fossil and the evolution of skin and feathers
A fossil of an ancient reptile shows a distinct crest that is made neither of feathers, scales or hair. It's forcing scientists to rethink reptilian evolution.
July 24, 2025
Astronomy Essentials
Delta Aquariid meteor shower: All you need to know in 2025
The nominal peak of the Delta Aquariid meteor shower is late July. But the shower rambles along steadily for weeks and intermingles with the famous Perseids.
July 24, 2025
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