What is the Brocken Spectre?

The Brocken Spectre is your own shadow, cast on mists below you, when you are mountain climbing. The shadow may appear enormous and has a ring around it.

Send your name to Mars

Want to send your name to Mars on NASA’s next rover mission in 2020? You’ll get your name etched on a microchip affixed to the rover – and a souvenir boarding pass. Here’s how.

Last quarter moon is May 26

The next last quarter moon falls on May 26, 2019, at 16:34 UTC. A last quarter moon rises around midnight and sets around noon the following day.

More West Antarctic glacier ice now unstable

By combining 25 years of satellite data, scientists have discovered that warming ocean waters have caused the ice to thin so rapidly that 24% of the glacier ice in West Antarctica is now affected.

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Huge double asteroid to pass safely May 25

Although it won’t be visible to the eye, professional and amateur astronomers are watching for asteroid 1999 KW4. It’s oddly shaped, about a mile wide, with a companion moon. Closest approach is May 25, 2019. Charts here for amateur observers across the globe.

New evidence for Pluto’s subsurface ocean

Does Pluto have an ocean? That idea seems preposterous at first, but a new study adds to the growing evidence for a subsurface ocean on this distant dwarf planet … and explains how it stays liquid.

Why the moon’s near and far sides look different

New research suggests that a wayward dwarf planet collided with the moon in the early history of the solar system, causing the stark difference between the moon’s heavily-cratered far side and the lower-lying open basins of its near side.

What Chang’e 4 learned from the moon’s far side

Early results from China’s historic 1st landing on the moon’s far side. Chinese scientists have used in situ data from a far side crater to identify materials on the moon’s surface that originated deeper inside the moon.

Magnetic north is shifting fast. What’ll happen to the northern lights?

As magnetic north shifts increasingly away from the geologic north pole – towards Siberia – studies suggest the northern lights could move with it.

See Beresheet spacecraft’s impact site on moon

NASA released before and after images of the spot on the moon where Israel’s Beresheet spacecraft crash-landed on April 11.

Scientists find new periodic water cycle on Mars

A new study shows that Mars has a unique water vapor cycle that occurs only once about every 2 years. The cycle might help explain how Mars lost most of its water.

Polaris is the North Star

Many people think Polaris is the sky’s brightest star. In fact, Polaris ranks only 50th in brightness. Still, Polaris is famous because the entire northern sky wheels around it.

Thuban is a former Pole Star

Thuban was the Pole Star some 5,000 years ago, when the Egyptians were building the pyramids.