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Listen: Have aliens already visited us?
A podcast featuring Harvard theoretical physicist Avi Loeb, on the subject of whether 'Oumuamua - the strange object that swept through our solar system in 2017 - is an artifact of an alien intelligence.
May 16, 2021
Warming is clearly visible in new US climate normals
Climatologists at NOAA have released updated climate "normals." They explain what "normal" means, how our U.S. climate normals have changed, and how to best make sense of them.
May 14, 2021
Photos: Young moon, Mercury, Venus, Mars
The brightest planet Venus has now returned to the evening sky, joining Mercury. It'll surprise you by appearing so bright, low in the western twilight. The moon swept past Venus Wednesday and Mercury Thursday ... this weekend, Mars!
May 14, 2021
See a nova or “new” star. V1405 Cas is now visible to the eye
A nova that first brightened in March of 2021 has now flared bright enough to be seen without binoculars or a telescope.
May 13, 2021
New type of aurora revealed in 19-year-old video
Scientists call it a "diffuse auroral eraser." That's because this newly named aurora first appears as a bright stripe over a diffuse auroral background. Then, when it disappears, it scrubs out the faint auroral light behind it.
May 13, 2021
Sharks navigate using Earth’s magnetic field
Longstanding mystery solved! New research shows that - just as lobsters, turtles and some birds do - sharks navigate using Earth's magnetic field,
May 13, 2021
Voyager 1 detects a hum in interstellar space
Now 8 years into its travels in the deep reaches of space between the stars, Voyager 1 has detected a faint, low-level hum. It stems from the vibration of the plasma, or ionized gas, in interstellar space.
May 12, 2021
Cool sun image
EarthSky readers submit wonderful photos to us every day. This week we received this interesting composite image of the sun, our nearest star.
May 12, 2021
Moon and 3 evening planets May 12-15
Use the waxing crescent moon to find 3 planets from May 12-15, 2021. You'll find Mercury, Venus and Mars in the west after sunset. Find them - look down at Earth below your feet - and you'll be seeing the whole inner solar system.
May 12, 2021
The Brood X cicadas are emerging now
Some areas of the United States are starting to report the emergence of the Brood X cicadas after their 17-year absence.
May 11, 2021
