Movement of celestial bodies
Spin about an axis.
Rotation
Continually changing dark regions of the sun which exhibit magnetic properties.
Sunspots
The observation that galaxies are receding at speeds proportional to their distance.
Hubble's Law
Third lunar landing attempt, but was abandoned when an oxygen tank ruptured two days into the mission.
Apollo 13
Orbit around another object
Revolution
Two black holes in close orbit around each other
Binary Black Hole
Identical to subatomic particles but with an opposite electrical charge. Includes positrons, antiprotons, and antineutrons.
Antimatter
The first United States space station launched by NASA.
Skylab
The type of eclipse that occurs when celestial objects are directly lined up.
Total Eclipse
A black hole that forms after a large star collapses and compresses.
Steller Black Hole
A theory for the end of the universe in which the current expansion would reverse and the universe would re-collapse on itself.
The Big Crunch
Japanese mission to explore Mars' largest moon Phobos and bring back samples.
MMX Mission
The type of eclipse that occurs when celestial objects are directly lined up.
Partial Eclipse
The center of a black hole, where the mass of the black hole is concentrated. Theoretically, it can have zero volume and infinite density.
Singularity
Accounts for the vast majority of matter in the universe but does not emit, absorb, or reflect light. It keeps rapidly rotating galaxies from flying apart.
Dark Matter
Telescope to succeed Hubble, revolving around the sun. The most powerful telescope ever launched into space.
James Wedd Telescope
The type of solar eclipse that occurs when the moon is farthest from the Earth, the sun appears as a ring around the moon.
Annular Eclipse
The boundary at the mouth of a black hole, past which light cannot escape. "Point of no return."
Event Horizon
Accounts for the vast majority of matter in the universe but does not emit, absorb, or reflect light. It accelerates the rate of expansion of our universe.
Dark Energy
Deliberately modifying the atmosphere, temperature, or ecology of a planet to make it habitable.
Terraforming