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Saturn stationary on August 13
A planet's "stationary point" doesn't mean it stops moving. In space, nothing ever stops moving. Instead, the "stationary point" is an Earth-centered illusion.
August 13, 2016
Saturn’s moon Titan has flooded canyons
They're steep-sided canyons with liquid in them, but the liquid isn't water. Instead, it's liquid hydrocarbons.
August 12, 2016
The circadian clock in your gut
Our internal circadian clock tells our body when to sleep, wake and eat. New research says that bacteria living in our gut also have their own circadian clocks.
August 12, 2016
Meteors, moon and planets on August 12
The moon's passage near these planets got lost a bit in the excitement over the Perseid meteor shower. But you can still see them!
August 12, 2016
Polar bears’ biggest threat is ice loss
Hunting used to be the biggest threat to polar bear survival. Not anymore.
August 11, 2016
Humpback whales, heroes of the sea?
Humpback whales appear to rescue not just their own species, but also other whale species, seals and sea lions from attacks by killer whales.
August 9, 2016
Shelf cloud over New Hampshire
Shelf clouds are what meteorologists call arcus clouds. They're low, mostly horizontal clouds, usually associated with a thunderstorm's leading edge.
August 8, 2016
Moon near star Spica on August 8
Bright star near the moon on August 8 is Spica in the constellation Virgo. This blue-white gem of a star is some 1,900 times more luminous than our sun.
August 8, 2016
Ice melt may release Cold War-era toxins
Formerly secret Camp Century in Greenland was abandoned beneath ice and snow. But the ice is melting, and biological, chemical and nuclear waste may be released as early as 2090.
August 7, 2016
