Astronomers Find Star Orbiting a Black Hole At 1 Percent the Speed of Light (sciencealert.com)

schwit1 writes: Astronomers have spotted a star whizzing around a vast black hole at about 2.5 times the distance between Earth and the Moon, and it takes only half an hour to complete one orbit. To put that into perspective, it takes roughly 28 days for our Moon to do a single lap around our relatively tiny planet at speeds of 3,683 km(2,288 miles) per hour. Using data from an array of deep space telescopes, a team of astronomers have measured the X-rays pouring from a binary star system called 47 Tuc X9, which sits in a cluster of stars about 14,800 light-years away. The pair of stars aren't new to astronomers -- they were identified as a binary system way back in 1989 -- but it's now finally becoming clear what's actually going on here. When a white dwarf pulls material from another star, the system is described as a cataclysmic variable star. But back in 2015, one of the objects was found to be a black hole, throwing that hypothesis into serious doubt. Data from Chandra has confirmed large amounts of oxygen in the pair's neighborhood, which is commonly associated with white dwarf stars. But instead of a white dwarf ripping apart another star, it now seems to be a black hole stripping the gases from a white dwarf. The real exciting news, however, is regular changes in the X-rays' intensity suggest this white dwarf takes just 28 minutes to complete an orbit, making it the current champion of cataclysmic dirty dancers. To put it in perspective, the distance between the two objects in X9 is about 1 million kilometers (about 600,000 miles), or about 2.5 times the distance from here to the Moon. Crunching the numbers, that's a journey of roughly 6.3 million kilometers (about 4 million miles) in half an hour, giving us a speed of 12,600,000 km/hr (8,000,000 miles/hr) - about 1 percent of the speed of light.

Comments

Re:Simple question

[silentcoder]

No actually - when they did it that was not where anybody else was heading. The supercomputing world was still ruled by Seymore Cray who was convinced that clusters could never compete with massive-chip systems in either cost or power.
And he still ruled the market.

NASA however, could not afford his computers anymore - and you know what they say about necessity and invention. So while others had theorised clusters before - nobody had tried to solve the issues of how to practically BUILD a super-computing cluster because the only game in the supercomputing town wanted none of it. NASA made them work - with beowulf - and it's noteworthy for it's impact (which was enhanced because NASA open-sourced the technology). Within two years the same idea was being used for redundancy and high-availability designs (expanding on the original 'build a cheap supercomputer' concept.
Every cluster in every data center in the world today is a direct descendent of NASA's design. It's a cornerstone of 21st century computing - and in the research side it's how EVERY super-computer is built now. But NASA pioneered it - when every expert thought it couldn't be done.