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Draw a line to match each vocabulary term with its definition.


a very dense star made up of neutrons

the point at the center of a black hole
escape velocity

the shrinking of a star caused by the pull of its own gravity
binary system

the speed at which an object must travel to escape the gravitational pull of another object

an explosion of a star that causes the star to shine a million times brighter than before

a process where atoms are joined and tremendous amounts of energy are released
accretion disk

two objects in orbit around each other
nuclear fusion

the huge space that contains all the matter and energy in existence
neutron star

a spiral of gas that can surround a black hole
event horizon

the spherical distance surrounding a black hole out of which nothing can escape

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Imagine the Universe! is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA's Goddard Space Flight Center.

The Imagine Team
Project Leader: Dr. Barbara Mattson
Curator: Meredith Gibb
Responsible NASA Official: Phil Newman
All material on this site has been created and updated between 1997-2014.
This page last updated: Thursday, 21-Nov-2002 11:20:10 EST