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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: Meet monster sunspot region AR4551
Sun news, October 16, 2026: Meet AR4551, a monster sunspot region on the Earth-viewed solar disk. It's got the potential for major M and even X flares.
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
Astronomy Essentials
Tonight
Visible planets and night sky guide for October
Visible planets and night sky guide. This evening look west for the crescent moon and red Antares. Watch a livestream here about the growing problem of space debris.
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
Today's Image
Strange cloud! What was it? Observers in U.S. East report
Many people up before sunrise on Tuesday morning saw a strange cloud. It was the plume from a SpaceX rocket. See stunning images here!
October 14, 2026
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