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Watch online today: Small, close-passing asteroid
Watch online today as asteroid 2020 SW swoops in for its closest approach to Earth on Thursday. The asteroid will pass just 7% of the moon's distance. Charts here for telescope users. How to watch online.
September 23, 2020
Astronauts shelter as ISS boosted to avoid orbital debris
The International Space Station underwent an unscheduled reboost in orbit yesterday, to avoid a collision with an unknown piece of space junk. The 3-man crew was ordered to shelter, but is safe.
September 23, 2020
The moon, Jupiter and Saturn September 23 to 26
On September 23, 24, 25 and 26, 2020, the moon can guide your eye to the solar system's 2 biggest gas giant planets, Jupiter and Saturn.
September 23, 2020
2020 Arctic sea ice minimum 2nd lowest on record
On September 15, 2020, Arctic sea ice reached its annual minimum extent, the 2nd-lowest on record. The Arctic region in general is warming 3 times faster than the rest of the planet.
September 22, 2020
A Chinese perspective on autumn
In Chinese thought, autumn is with the direction west, considered to be the direction of dreams and visions.
September 22, 2020
Equinox sun is over Earth’s equator
At an equinox, and for several days before and after, the midday sun is straight up at noon seen from Earth's equator. At this equinox, the sun is crossing the celestial equator, moving from north to south.
September 22, 2020
Satellite data helps climbers ascend Mt. Everest
Data from ESA's Copernicus Sentinel-2 satellite help climbers negotiate a treacherous glacier on the route to Mt. Everest's summit.
September 20, 2020
Cool new Hubble portrait of Jupiter’s storms
A beautiful new image of Jupiter from the Hubble Space Telescope - captured in August 2020 - shows the planet's icy moon Europa as well as several famous storms in Jupiter's atmosphere.
September 19, 2020
Young moon after sunset September 18 to 21
After sunset these next several days - September 18, 19, 20 and 21, 2020 - watch for the waxing crescent moon's return to the evening sky.
September 18, 2020
