Astronomers discovered a new asteroid, four days after it made a near miss of the Earth. The object, now called 2002 EM7, was between 40 and 80 metres across and missed the planet by a distance of only 480,200 kilometres – the 9th-closest brush ever recorded; roughly the distance from the Earth to the moon. Had it actually hit the Earth, it could have flattened a city and caused thousands of deaths.
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74 million kilometres is a huge distance from which to observe something. But 74 million…
Astronomers have only been aware of fast radio bursts for about two decades. These are…
How do you weigh one of the largest objects in the entire universe? Very carefully,…