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Circumpolar stars never rise or set
Circumpolar stars always reside above the horizon, and for that reason, never rise or set. All the stars at the Earth’s North and South Poles are circumpolar. Meanwhile, no star is circumpolar at the equator.
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Groundhog Day has roots in astronomy
Groundhog Day is tied to the movement of Earth around the sun. It’s the year’s first “cross-quarter” day.
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Happy 30th Birthday, Supernova 1987A – Sky & Telescope
The brightest supernova since the invention of the telescope erupted 30 years ago. The remnant of the supernova explosion continues expanding.
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How Astrophysicists Found a Black Hole Where No One Else Could
A new method could help scientists peer inside universe’s densest star clusters to find undiscovered black holes
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Kepler Telescope Releases Trove of Data on Newfound Earth-Size Exoplanets
The planet-hunting observatory stared at the TRAPPIST-1 system for nearly three months
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Laniakea: Our home supercluster
A team based in Hawaii has come up with a new technique that maps the Universe according to the flow of galaxies across space
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Moon and Winter Circle next few evenings
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Moon near Aldebaran on February 5
Residents of North America will see the moon to the east of Aldebaran, the brightest star in the constellation Taurus the Bull. As always, the dark side of the waxing moon points eastward while the lit side points westward.
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New Webinar: How to Photograph the Milky Way, with Babak Tafreshi
Join Sky & Telescope Contributing Photographer Babak Tafreshi for a live webinar to learn the secrets of stunning Milky Way photography.
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Opportunity Rover celebrates 13 years on Mars
On January 24, 2017, NASA’s Opportunity rover celebrated 13 Earth years exploring Mars. She’s officially a teenager. Here are 6 ways she’s behaving like one
