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Perihelion: What is it and when does it occur?
By Tereza Pultarova last updated
Reference Perihelion is the point at which an orbiting body is closest to the sun. The word comes from Greek and literally means around (peri) the sun (helios).
Why Comet G3 (ATLAS) will be 'remembered as the Great Comet of 2025' (photos)
By Joe Rao published
C/2024 G3 (ATLAS) is one of the few comets on record that became bright enough to be visible in the daytime without optical aid like binoculars or a telescope.
What is the moon phase today? Lunar phases 2025
By Tariq Malik, Daisy Dobrijevic last updated
Reference See what moon phase it is tonight and find out when you can see the rest of the moon phases for 2025.
Earth is bombarded with rocks from space — but who gets to keep these ultimate antiques?
By Anna Marie Brennan published
Every day, about 48.5 tons of space rock hurtle towards Earth.
Mysterious Mars mounds may bolster case for ancient Red Planet ocean
By Keith Cooper published
Buttes and mesas in Mars' Chryse Planitia contain clay minerals made from liquid water interacting with the rock nearly 4 billion years ago.
Invisible 'flickering' on the sun could predict potentially dangerous solar flares hours in advance
By Harry Baker published
Images captured by NASA's Solar Dynamics Observatory have revealed that "coronal loops" give off subtle flashes of ultraviolet light before a solar flare, which could act as an early warning system for dangerous space weather.
Volcanic cones on Mars tell a tale of ice and fire
By Victoria Corless published
A study of volcanic cones near the equator on Mars is challenging what scientists previously knew about when and where water flowed on Mars.
Earth's recent asteroid visitor might've been a piece of the moon
By Sharmila Kuthunur published
Earth's temporary asteroid friend last year was a chunk of its real moon that had been blasted into space thousands of years ago, scientists find.
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