Card Set Information
When did the Big Bang occur?
14 billion years ago
When did the Sun form?
5 billion years ago
What is a small whose object ice can vaporize in sunlight forming an atmosphere of dust and gas? sometimes has a tail.
What are the two types of comets?
What is an asteroid?
usually made of rock but can be composed of metal
What is a meteoroid?
a small particle from a comet or asteroid orbiting the sun
much smaller than asteroids
some are collision impact degrees
What is a meteor?
light phenomena that results when a meteoroid enters Earth's atmosphere and vaporizes
What is a meteorite?
a meteoroid that survives passage through earth's atmosphere and lands on earth's surface
What is an airburst?
an object that explodes in the atmosphere
What is Tunguska?
caused by an airburst
occurred when a an asteroid/comet fragment collided into the earth