Limitations of asteroid crater lakes as climate archives
In southern Germany just north of the Danube, there lies a large circular depression between the hilly surroundings: the Nördlinger Ries. Almost 15 million years ago, an asteroid struck this…
NASA Astronomers Predict Near-Earth Asteroid’s 2029 Close Encounter
About 5 and a 1/2 years from now, astronomers predict, an asteroid about as wide as the Empire State Building is tall will streak through space within 20,000 miles (32,200…