1.
Apollo: American program to land people on the moon
2.
Armstrong: the first person to walk on the moon
3.
center of the moon may be molten: data collected from moonquakes shows this
4.
China: rocket technology originated here
5.
gas is propelled out of the back of the rocket: rockets move forward because of this
6.
lunar rover: small robots that can move around on the surface of a planet
7.
modules: Internatinal Space Station is made up of many different
8.
moon rock: scientists learned much about the moon by studying _____brought back by astronauts
9.
multistage rocket: Saturn V was a powerful ______rocket that launced spacecraft to the moon.
10.
multistage rocket: a ______ rocket has parts that fall off after their fuel is burned up
11.
Observing the Earth's surface: one of the main uses of satellites
12.
opposite: gases expelled from the rear of a rocket push the rocket in the ____direction as the gases
13.
orbirtal velocity: the velocity a rocket must reach to establish an orbit around Earth is
14.
satellite: any object that revolves around another object in space is
15.
shuttle: NASA astronauts are carried into space mainly by space _____
16.
solar panels: main source of power for the International Space Station
17.
Space shuttle: used many times to carry astronauts into orbit
18.
space station: large artificial satellite on which people can live and work for long periods
19.
studying moon rocks gathered by astronauts: much of what scientists know about the moon has come from this
20.
the next stage ignites and the empty fuel container falls away: what happens in the multistage rocket when the first stage is out of fuel
21.
the weight of the rocket is reduced as the rocket rises: the main advantage of multistage rocket
22.
thrust: a rocket burns fuel to produce this which forces the rocket forward
23.
US and Soviet Union: space race was between what two countries
24.
vacuum: place that is empty of all matter
25.
velocity: speed in a given direction
