NASA’s gamma-ray observatory is in safe mode after a possible wheel failure

A visualization of the Neil Gehrels Swift Observatory.  (Image credit: NASA) NASA’s Neil Gehrels Swift Observatory has temporarily stopped its science observations while the mission team investigates an issue. On Tuesday night (Jan. 18), the observatory, a gamma-ray hunting space telescope originally called the Swift Gamma-Ray Burst Explorer, went into safe mode and paused all science work. This maneuver may have been in response to a reaction wheel failure, which the mission team continues to explore.  Swift uses a total of six reaction wheels to autonomously point itself in the…

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The Nearest Stars to Earth (Infographic)

The nearest stars, their distances in light-years, spectral types and known planets. (Image credit: Karl Tate, SPACE.com contributor) Stars speckle the expanse of our ever-expanding universe. While our closest star is the sun that we orbit in our little corner of the cosmos, we can peer out to see what stellar neighbors live nearby. The nearest stars to Earth are three stars that lie about 4.37 light-years away in the Alpha Centauri triple-star system. The closest of these stars, Proxima Centauri, is just about 4.24 light-years away. (for reference, one…

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Bad weather delays SpaceX Dragon’s departure from space station to Saturday

A SpaceX resupply ship will have to wait at least one more day before returning to Earth. Yesterday (Jan. 19), cosmonauts Anton Shkaplerov and Pyotr Dubrov ventured outside the safe confines of the International Space Station to conduct a seven-hour, 11-minute spacewalk. While the pair cleaned up following the spacewalk, SpaceX was preparing its robotic Dragon cargo ship to come back to Earth. Unfortunately, the weather had other plans.  The Dragon craft, which had previously been scheduled to come home on Friday (Jan. 21), is now planning to undock from…

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