A visualization of the orbit of (415029) 2011 UL21, a near-Earth object that completes 11 revolutions around the sun in almost the exact same amount of time in which Earth completes 34 revolutions (i.e., 34 years), creating this pattern when plotting the asteroid’s location relative to Earth.
New software let scientists re-examine old radar images, providing some of the strongest evidence yet that volcanoes continue to reshape the hellish planet.
A brilliant flash of blue, green and white on Saturday night came from a shard of an as yet unidentified comet that was moving around 100,000 miles per hour, experts said.
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