| atmosphere |
the gases that are in the space around the earth and other similar objects in outer space. [1/2 definitions] |
| bioastronautics |
(used with a sing. verb) the science of the effects of outer space and space travel on living organisms. |
| celestial |
of or having to do with the sky or outer space. [1/2 definitions] |
| cosmic rays |
streams of high-energy charged atomic nuclei or other particles that enter the earth's atmosphere from outer space. |
| ether |
outer space. [2/4 definitions] |
| life-support system |
the system of equipment in a spacecraft that keeps the occupants alive in outer space. [1/2 definitions] |
| meteorite |
a piece of rock from outer space that has landed on Earth. |
| meteoroid |
matter, ranging in mass from a speck to thousands of tons, that travels through outer space and occasionally passes through the earth's atmosphere. |
| mission |
an individual or a team of people whose goal is to explore and gather information about a new territory or part of outer space, or a particular instance of travel and exploration by such people. [1/7 definitions] |
| outside |
on, in, or to the outer space of. [1/6 definitions] |
| planet |
a large object in outer space that moves around the sun or another star. |
| science fiction |
a kind of fiction writing that is often about people living in the far future or about life on other planets or in other galaxies. Science fiction often tells of future scientific inventions or of strange beings or creatures from outer space. |
| shooting star |
a chunk of metal or rock from outer space that burns up as it enters the earth's atmosphere; meteor. |
| space |
the area that contains the entire universe beyond the earth; outer space. [1/7 definitions] |
| spacecraft |
a vehicle designed to travel in outer space. |
| spaceman |
a man who travels in outer space, beyond the earth's atmosphere; astronaut. [2 definitions] |
| spaceship |
a vehicle designed to carry people and cargo in outer space, as to the moon or the other planets. |
| spacesuit |
a suit worn by astronauts that lets them breathe in outer space. |
| spacewalk |
the action of an astronaut moving about outside a spacecraft in outer space. |
| spacewoman |
a female visitor to earth from outer space, as in science fiction. [1/2 definitions] |
| telescope |
an optical instrument, usu. cylindrical, that employs lenses and sometimes mirrors to enlarge the images of distant objects, esp. those in outer space. [1/7 definitions] |