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Astronomy Essentials
Tonight
Visible planets and night sky guide for October
Visible planets and night sky guide. Saturn is opposite the sun today. And see a video about the Southern Hemisphere view of Mercury and Venus.
October 4, 2026
Human World
Space
World Space Week is October 4 to 10. Find events here
World Space Week dates back to 1999 and runs every year from October 4 to 10. This year, the theme is The Rocket Revolution. Find events near you here.
October 4, 2026
Sun
Sun news: Coronal hole winds set to spark auroras
Sun news October 4, 2026: Coronal hole solar wind arrives today. Forecasters expect a minor geomagnetic storm with possible aurora for northern Scotland.
October 4, 2026
Space
How a helium leak in an exoplanet atmosphere hints at life
A tentative helium detection may offer the 1st glimpse of this exoplanet atmosphere, but we'll need more evidence to know if LHS 1140b could host life.
October 4, 2026
Earth
What are the world’s loudest birds? Here are 2 contenders
What are the world's loudest birds? Researchers say the bare-throated bellbird and red-legged seriema are 2 major contenders.
October 4, 2026
Earth
And the Fat Bear Week winner is … Backpack!
Congrats to Backpack, the winner of Fat Bear Week 2026! Take a look at the final brackets and see where your favorite fatties fell.
October 3, 2026
Human World
October birthstone: Colorful opal and tourmaline
Take your pick: the October birthstone is either the striking iridescent opal or the many-colored tourmaline. Learn the lore of these pretty gemstones here.
October 3, 2026
Space
Is this an alien radio signal from a super-Earth exoplanet?
Did China's FAST radio telescope detect an alien radio signal coming from the super-Earth exoplanet K2-155 d? Probably not.
October 2, 2026
Space
Could an Earthlike planet with 2 stars be nearby?
A new astronomical model has found that an Earthlike planet could have a stable and potentially habitable orbit around a star in a nearby 2-star system.
October 2, 2026
Space
Life on Enceladus? 2 new studies boost chances
Is there life on Enceladus? Two new studies show that the chances for life in the ocean of this Saturn moon are even greater than once thought.
October 1, 2026
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