Today’s spacewalk is underway! 👨🚀👨🚀At 6:39am ET, @AstroDrewMorgan and @Astro_Luca set their spacesuits to battery power, marking the beginning of a 6.5 hour spacewalk to repair a cosmic ray detector. Watch live coverage: https://t.co/OOqcxiShFH
What caused the brightest X-ray burst ever seen by our @NASAUniverse NICER telescope? 🤔
A massive thermonuclear flash from the remains of a star that exploded as a supernova. The explosion released as much energy in 20 seconds as the Sun does in 10 days.
https://t.co/url5YzDobS