Most space rocks that enter Earth's atmosphere burn up before they come close to the ground. We see them as meteors. Fortunately for us, nearly all such objects that streak through our skies are just meteors about the size of a piece of gravel or smaller. But a few are bigger and are worth worrying about. Continue reading →
¡SkyCaramba! Weekly astronomy blog for the week ending February 14, 2015
Every year or two, a near-earth asteroid or other object is in the news. People want to know if it will hit the earth. It would be wrong to say it can never happen. But it would also be wrong to say it’s very likely.
Most space rocks that enter Earth’s atmosphere burn up before they come close to the ground. We see them as meteors. Meteors enter the atmosphere all the time. You can go outside on any clear night where you have a dark sky and see one if you wait long enough. U.S. military defense systems designed to track heat trails from missiles started detecting meteor trails as soon as they went online in the 1970s.
Fortunately for us, nearly all such foreign objects that streak through ...