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Every calendar year has at least 4, but 5, 6 or even 7 eclipses are also possible. Why don’t we see them all?
Retrograde motion of Jupiter or Mars or Saturn in our sky is an illusion, caused by Earth’s passing these slower-moving outer worlds. But there’s a real retrograde motion, too.
In 1963, Maarten Schmidt suddenly realized that quasars are exceedingly distant and unimaginably luminous. His revelation changed our notion of what the universe is like.
The 2017 Chinese New Year – which coincides with the January new moon – starts this weekend and rings in the Year of the Rooster.
When a common year of 365 days starts on a Sunday, as it does this year, 2 Friday the 13ths are inevitable. The 1st one is in January.
Can Mars ever appear as large as the moon in Earth’s sky? Heck no.
Delay those New Year’s plans. World timekeepers will add a leap second just before midnight on December 31, 2016.
December solstice sunrise comes at the same time for St. Augustine, Florida and New York City. But St. Augustine has an hour more of daylight than New York. Here’s why.
Peak night for the Geminids in 2016 is December 13 (morning of December 14). Best around 2 a.m. Moonlight interferes but these meteors are bright. Maybe you’ll catch a cool photo!
Lucy lived 3.18 million years ago in what’s now Ethiopia. An analysis of high-resolution CT scans of her fossilized skeleton shows she was equipped for climbing trees.
Usually there are only 3 last quarter moons in a season. The November 21, 2016 last quarter moon, though, counts as the 3rd of four.
On November 14 1963, crew aboard a trawler sailing near Iceland spotted a column of smoke rising from the sea surface. A new island, Surtsey, was being born.
Seeing animals in clouds, or a face in the moon, are examples of pareidolia. Look here for photos to test your own ability to see things that aren’t there.
Mount Hekla is Iceland’s 3rd most active volcano. A large eruption in 1104 earned it the moniker Gateway to Hell. Is Mount Hekla overdue for another eruption?
The Hindu festival of Diwali was October 30, 2016. It’s a festival of light! But can you see the light of Diwali from space?
Lunar months vary in part because the moon’s orbit around Earth isn’t a perfect circle. Longest (and shortest) lunar months in 2016, here.
Satellite data and ocean sensors show a definite slowdown since 2004 in ocean currents that warm eastern North America and western Europe.
Do you want a blanket? Norwegian researchers recently described how they trained horses to use symbols to answer that question.
Sputnik’s unassuming beep ushered in the Space Age. Hear it here.
Stalagmites on the floors of caves in southern Indiana contain evidence of past earthquakes, scientists say.
Ring of fire eclipse on Sunday
Last flight gone