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Astronomy Essentials
Are day and night equal at the equinox?
Are day and night equal at an equinox? No. Earth's atmosphere and our sun team up to give us more day than night at an equinox.
September 16, 2021
Astronomy Essentials
September equinox: All you need to know
The equinox is September 22. From around the world on the day of an equinox, the sun pretty much rises and sets due east and west.
September 16, 2021
Space
SpaceX lasers define next era of Starlink technology
SpaceX lasers launched this week with a new batch of Starlink satellites marks a transition in tech for the satellite broadband network.
September 15, 2021
Astronomy Essentials
Harvest Moon 2021: All you need to know
In 2021, the Northern Hemisphere's Harvest Moon falls on September 20, or less than 2 days before the autumn equinox.
September 15, 2021
Space
Rerun of a supernova blast expected 2037
Astronomers expect to see a rerun of a supernova blast, whose light traveled 10 billion years to reach us, in about the year 2037.
September 15, 2021
Tonight
Moon, Saturn, Jupiter September 15 to 18
Watch for the moon, Saturn, Jupiter on September 15 to 18, 2021.
September 15, 2021
Space
Impact on Jupiter surprises skywatchers
An impact on Jupiter has stargazers looking skyward to see if they can spot any lingering evidence of the September 13, 2021, event.
September 14, 2021
Space
Missing impact debris mystery solved?
Where is the missing impact debris from the early solar system? A new study says it was probably vaporized into gas that subsequently escaped the solar system.
September 14, 2021
Brightest Stars
Alpha Cephei, a fast-spinning star
Alpha Cephei, in the constellation Cepheus the King, is a bit of an enigma. It’s spinning so fast that it appears like a slightly flattened beach ball.
September 14, 2021
Astronomy Essentials
Mercury greatest elongation September 14, best for S. Hemisphere
Watch for Mercury from Southern Hemisphere locations in late August, through September, 2021. Meanwhile, from northerly latitudes, bring binoculars!
September 13, 2021
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