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Astronomy Essentials
Tonight
Visible planets and night sky guide for October
Visible planets and night sky guide. In the east before dawn, look for Jupiter and Mars as they get closer and closer together.
October 17, 2026
Space
Caves on the moon are target of new NASA mission
NASA wants to search for caves on the moon. A new mission named GIMLI will land and examine a volcanic pit — the Marius Hills Pit — in the vast, dark lunar lava plain known as Oceanus Procellarum.
October 16, 2026
Human World
No more leap seconds! Timekeeping is officially changing
The world’s timekeepers announced on Thursday that leap seconds will no longer be added to clocks starting in May 2027.
October 16, 2026
Earth
US winter weather outlook: What will El Niño bring?
NOAA's winter winter outlook says El Niño will bring a warm and wet winter for much of the U.S.
October 16, 2026
Space
2nd-generation planet: Was this world born around a dead star?
Astronomers might have found a new 2nd-generation planet orbiting a white dwarf star. It could also help answer a "cold case" mystery about the white dwarf.
October 16, 2026
Space
Space is getting crowded. Here’s the latest satellite report
ESA reports on the state of low-Earth orbit. The number of satellites in orbit is skyrocketing, along with the chance for collisions and on-ground casualties.
October 16, 2026
Sun
Sun news: Huge sunspot still blasting out flares
Sun news, October 17, 2026: Monster sunspot delivered an impulsive M1.4 flare at 15:42 UTC on October 16. Meanwhile a large coronal hole rotated now facing directly Earth.
October 16, 2026
Constellations
Cassiopeia the Queen is overhead on autumn evenings
Spot the constellation Cassiopeia the Queen somewhere in the northern sky during much of the year, throughout much of the night. It's high overhead now.
October 16, 2026
Space
Planetary systems fall into 2 distinct families, astronomers say
Astronomers studying planetary systems in the Milky Way have found they can be sorted into 2 families. These families are largely determined by the host star.
October 15, 2026
Tonight
What star in the northeast flashes colorfully? It’s Capella!
If you're in Earth's Northern Hemisphere and see a bright star twinkling with red, green and blue flashes low in the northeast on October evenings, it's probably Capella. See charts here!
October 15, 2026
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