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Glossary
asteroid (AS-teh-royd) A large planet (PLAN-et) A large object in
rock that is orbiting the Sun. An space that is orbiting the Sun. Some
asteroid can be as small as a car or planets, such as Earth, are made of
bigger than a mountain. rock. Others, such as Jupiter, are
made of gases and liquids.
comet (KAH-mit) A space object
made of ice, rock, and dust that is probe (PROBE) A spacecraft
orbiting the Sun. that does not have any people
aboard. Probes are usually sent to
dwarf planet (DWARF PLAN-et) planets or other objects in space
A round object in space that is to take photographs and collect
orbiting the Sun. Dwarf planets information. They are controlled by
are much smaller than the eight scientists on Earth.
main planets.
rotate (ROH-tate) To spin around.
eclipse (ee-KLIPSS) The blocking of
the light from one space object by solar system (SOH-ler SIS-tem)
another. During a solar eclipse, the The Sun and all the objects that
Sun’s light is blocked by the Moon. orbit it, such as planets, their
moons, asteroids, and comets.
gas (GASS) A substance, such as
oxygen or helium, that does not star (STAR) A huge ball of burning
have a definite shape or size. gases in space. Our Sun is a star.
orbit (OR-bit) To circle, or move
around, another object.
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