Could we create a black hole in a laboratory on Earth?
“Can anyone make a black hole in a laboratory?” — Sohini B., age 13, Kolkata, West Bengal, India A black hole is an object so massive and dense that even light cannot escape its gravity. They occur in space when extremely dense objects, such as the centers of stars, collapse. All the black holes observed …
Is the Moon drifting away from the Earth?
“Is the Moon getting farther away from the Earth?” — Judah, age 9, Broken Arrow, Oklahoma The Moon is moving 1½ inches (3.8 centimeters) farther away from the Earth every year. Scientists measure the distance to the Moon by bouncing lasers off mirrors placed there by space probes and astronauts. By measuring the amount of …