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Space
Super-Earths might be solid deep on the inside
Super-Earths might be solid in their deep insides, a new study says. Minerals might take unusual forms and remain solid despite the intense heat and pressure.
August 19, 2026
Sun
Sun news: Auroras continued last night, and more to come!
Sun news August 19, 2026: A pair of geomagnetic storms brought auroras to northerly latitudes overnight, with more likely today and tomorrow.
Clusters Nebulae Galaxies
The Great Rift is a dark swath in the Milky Way
The Great Rift or Dark Rift is a darkened swath of the Milky Way where new stars are forming. It's best seen from a rural location away from light pollution.
August 19, 2026
Constellations
Is Ophiuchus the 13th constellation of the zodiac?
The sun passes through Ophiuchus for about 2 weeks every year, so why isn’t this constellation considered the zodiac’s 13th sign?
August 19, 2026
Astronomy Essentials
Tonight
Visible planets and night sky guide for August
Visible planets and night sky guide: Join EarthSky’s Deborah Byrd for a livestream preview of the August 27-28 near total lunar eclipse at noon CDT (17 UTC).
August 19, 2026
Space
1st ultra-faint Milky Way satellite galaxy found by Rubin
The Vera C. Rubin Observatory has only just begun its survey, yet it has already discovered its first ultra-faint Milky Way satellite, Aquarius IV.
August 18, 2026
Astronomy Essentials
Give me 5 minutes and I’ll give you Saturn
We're now in the best months for viewing Saturn in 2026. It'll be at it's best around October 4 when it's closest to Earth and visible all night.
August 18, 2026
Space
A moon for Mars! Asaph Hall finds Phobos 149 years ago
On this date in 1877, astronomer Asaph Hall discovered a moon for Mars: Phobos, the larger of 2 moons. He discovered the other moon, Deimos, later that year.
August 17, 2026
Space
Swift spacecraft, and a mission to save it, caught on video
The Swift space telescope is falling back to Earth. The LINK spacecraft is trying to save it. See both in orbit in a new video.
August 16, 2026
Space
Were these polygonal cracks on Venus once on a seafloor?
Sprawling, huge cracks on Venus have long puzzled scientists. A new study suggests the polygon shapes formed from drying mud on an ancient seafloor.
August 15, 2026
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