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http://www.dailymail.co.uk/sciencetech/article-5279587/A-potentially-hazardous-asteroid-flying-past-Earth.html ‘Potentially hazardous’ asteroid the size of the Burj Khalifa is heading towards Earth at 67,000mph The 2002 AJ129 asteroid has been classed a 'potentially hazardous' by Nasa It will fly past on 4th February at speeds of 67,000mph (107,826kmh) This makes it nearly 15 times faster than the world's quickest manned aircraft By Phoebe Weston For Mailonline Published: 17 January 2018 A gigantic asteroid which is larger than the world's tallest building, the Burj Khalifa, will hurtle past our planet in around two weeks time. The 2002 AJ129 asteroid has been classed a 'potentially hazardous' by Nasa and will fly past at speeds of 67,000mph (107,826kmh). This makes it nearly 15 times faster than the world's quickest manned aircraft - the hypersonic North American X-15, which travelled at 4,520mph (7,300kmh). The asteroid is around 0.7 miles (1.1km) wide - making it longer than the Burj Khalifa in Dubai, which stands at 0.5 miles high (0.8km). It is set to pass by our planet on the 4th February at a distance of around 2,615,128 miles (4,208,641km) away - which is relatively close in space terms. For reference, the distance between the Earth and the moon is 238,855 miles (384,400 km). Nasa describes asteroids as 'hazardous' if they come within 4,600,000 miles (7,403,00km) of our planet. It is the largest space rock to brush past our planet this year and previous research has found a rock of this size could plunge Earth into a mini-ice age if it hit. The impact would cause average temperatures around the world to fall by as much as 8°C, according to a 2016 study on the effects of a collision with a 0.6-mile-wide (1km) asteroid. Scientists warned the 'very severe global impact' would last several years, causing the world to become a much darker, colder and drier place. 'These would not be pleasant times,' Charles Bardeen, of the National Center for Atmospheric Research said during a presentation at the American Geophysical Union (AGU) at the time. 'As of December 24, there are 17,495 known Near-Earth Objects (NEOs) around our planet; 17,389 are asteroids', a Nasa spokesperson told the Express last month. 'This year, we discovered 1,985 new near Earth asteroids. There were 1888 such objects discovered in 2016 and 1,571 in 2015'. Nasa is currently moving forward with a refrigerator-sized spacecraft capable of preventing asteroids from colliding with Earth. A test with a small, nonthreatening asteroid is planned for 2024. This is the first-ever mission to demonstrate an asteroid deflection technique for planetary defence. The Double Asteroid Redirection Test (DART) would use what is known as a kinetic impactor technique—striking the asteroid to shift its orbit. The impact would change the speed of a threatening asteroid by a small fraction of its total velocity, but by doing so well before the predicted impact, this small nudge will add up over time to a big shift of the asteroid's path away from Earth. ...
