Space Exploration Crossword

A U.S. Air Force Base in southern Nevada, rumored to be where the government hides alien visitors.
A supposed encounter with a UFO or with aliens.
Anonymous dark-clothed men.
There was a UFO incident here in 1947.
Scientific effort to discover intelligent life elsewhere in the universe.
A mysterious object seen in the sky, no scientific explanation ever found.
A person who studies UFO's.
Area of standing crops that has been flattened in the form of a circle or more complex pattern.
Of or from the earth or its atmosphere.
The action or an instance of forcibly taking someone away against their will.
A long distance or great amount of time.
A hypothetical connection between widely separated regions of space-time.
The rapid expansion of matter from a state of extremely high density and temperature to current cosmological theories marked the origin of the universe.
A group or cluster of stars.
The branch of science that deals with the origin of the universe, especially the solar system.
The science of the origin and development of the universe.
a non- Sl unit of spectral flux density.
A unit of distance used in astronomy.
Is the galaxy group that includes the Milky Way.
A large plain or valley.
A massive and extremely remote celestial object.
A member of any of several classes of astronomical bodies.
A red dwarf, a small mass star.
Abbreviation for an alien life form
An unidentified flying object of presumed extraterrestrial origin.