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detected


noticed or discovered something

distract


to draw someone’s attention to something else

irrational


not based in reality; not making sense

immune system


the system that protects your body against disease
and infection

symptoms


changes in the body that are part of an illness

atmosphere


the layer of gases that surrounds the Earth

satellite


something built by humans that is sent into space to orbit,
or circle around, the Earth

extinct


when all members of a certain type of animal or plant die off,
that animal or plant is extinct

catastrophe


an event that causes terrible damage; a disaster

meteor


a space rock that creates a streak of light as it burns up
while entering the atmosphere

asteroids, meteoroids


rocks in space that are larger than 10 meters (about 33 feet) across; smaller rocks in space are called meteoroids

meteorites


any pieces of rock from space that have landed on Earth

meteors


rocks that create streaks of light as they enter the atmosphere and burn up