Centauri Dreams 6 Jun 2019, 17:22 UTC The two components of 1999 KW4, separated by about 2.6 kilometers, were moving at approximately 19.5 kilometers per second as they flew past the Earth, a challenge for observers not only because of their faintness and fast motion, but because atmospheric conditions were unstable at the time and the SPHERE adaptive optics system crashed more than once, though operations were quickly restored. The asteroid and tiny satellite reached a minimum distance of 5.2 million kilometers from Earth on May 25, about 14 times the distance to the Moon.
New Scientist 6 Jun 2019, 14:45 UTC For at least five years, a distant star has been calm and constant. Then, it suddenly went dim. Over the course of two days, it lost 70 per cent of its brightness. By two more days later, it was back to normal. Astronomers haven’t a clue why.
Bad Astronomy 6 Jun 2019, 13:00 UTC The Battle of Wolf 359 was good for only two things: 1) It delayed the Borg enough to allow the Enterprise to stop them from assimilating Earth, and b) it gives me a chance to tell you about a really cool star. Literally: Wolf 359 is a dinky red dwarf.
SciTech Daily 6 Jun 2019, 03:10 UTC Through decades of study, astronomers have developed a clearer picture of the chaotic and crowded neighborhood surrounding the supermassive black hole at the center of the Milky Way. Our galactic center is approximately 26,000 light-years from Earth and the supermassive black hole there, known as Sagittarius A* (A “star”), is 4 million times the mass of our Sun.
SPACE.com 5 Jun 2019, 21:54 UTC The grandfather paradox is a potential logical problem that would arise if a person were to travel to a past time. The name comes from the idea that if a person travels to a time before their grandfather had children, and kills him, it would make their own birth impossible. So, if time travel is possible, it somehow must avoid such a contradiction.
Astro Watch 5 Jun 2019, 16:10 UTC It’s one of the greatest and longest-running mysteries surrounding, quite literally, our sun—why is its outer atmosphere hotter than its fiery surface? University of Michigan researchers believe they have the answer, and hope to prove it with help from NASA’s Parker Solar Probe.