a person who travels in space
Two astronauts walked into the space craft.
debate
to have a formal discussion where people express different opinions to help solve a problem
Some people debate whether the station is a waste of money.
expensive
being costly; having a high price or value
Diamond rings are expensive.
international
involving or occurring between two or more countries
An international film festival takes place in October every year.
message
information that is left for or sent to someone else
She's out right now. Can I take a message?
orbit
to circle around something
The Earth orbits the sun every 24 hours.
research
the careful study of sources to discover information about a subject
The research showed us that our theory was correct.
satellite
a natural object in space that moves in a circle around another object, such as a moon
Many satellites orbit the earth.
schedule
to plan to do something at a certain time
The station is scheduled to keep flying until 2015 or later.
unaided
without help from anyone or anything else
Fleas can be seen with the unaided eye.
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