planet- a large body in space that revolves around a star

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Chapter 5
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planet- a large body in space that revolves
around a star
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asteroid- a small rocky object that orbits the Sun
Many scientists believe that the dinosaurs were
killed from the effects of an asteroid that hit
the Earth 65 million years ago.
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They all start off in space. They are like
asteroids, but smaller. They all start as
meteoroids. They are chunks of rock in space.
When they enter our atmosphere, they burn. Those
burning are called meteors. Most burn until
there is nothing left. If there is something
left and it makes it to the Earths surface, it
is called a meteorite.
Meteorites, Meteors, and Meteoroids
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light-year- unit of measurement for distances in
space it equals the distance light travels in a
year (its about 5.8 trillion miles)
Distances are so large in the universe that we
cant really use miles. Light years are just
easier. Its also interesting to think about the
light we are seeing. For instance, when we look
at things in the sky, we dont actually see how
they look right now we see what they looked
like. When we see the Moon- we see it as it was
1 second ago Sun- 8 minutes ago Saturn- 80
minutes ago Sirius (the brightest star)- 8.5
years ago Andromeda galaxy- 2.2 million years ago
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comet- a small, orbiting body made of dust, ice,
and frozen gases
Here is a picture of Halleys comet and two
images of its odd orbit.
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inner planets- the four planets of our solar
system that are closest to the sun
Mercury, Venus, Earth and Mars
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magnitude- the brightness of a star as perceived
from Earth
In this picture of stars it seems that some are
bigger or closer than others. That may or may
not be true it also has to do with their
magnitude. For instance, Betelgeuse looks
brighter than Alnilam, but it is not. Alnilam is
much farther from us.
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outer planets- the four planets of our solar
system farthest from the Sun
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solar system- a Sun (star) and all the bodies in
space that revolve around it
The Kepler-30 solar system has a parent planet
with three planets in orbital alignment circling
it.
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star- a giant sphere of glowing gases
Many people think our Sun is the biggest star.
Its not. There are many stars that are bigger
than our Sun. Keep in mind that you can fit one
million Earths in our Sun. Then notice the
picture to the left. Our Sun is a tiny dot
compared to the star known as VY Canis Majoris.
Try to imagine how many planet Earths could fit
inside it!
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Quiz Time! asteroid, comet, inner planets,
light-year, magnitude, meteor, meteorite,
meteoroid, outer planets, planet, solar system,
star
Which word means the four planets farthest from
the Sun?
outer planets
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Quiz Time! asteroid, comet, inner planets,
light-year, magnitude, meteor, meteorite,
meteoroid, outer planets, planet, solar system,
star
Which word means matter that made it to Earths
surface from space?
meteorite
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Quiz Time! asteroid, comet, inner planets,
light-year, magnitude, meteor, meteorite,
meteoroid, outer planets, planet, solar system,
star
Which word means a large body that revolves
around a star?
planet
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Quiz Time! asteroid, comet, inner planets,
light-year, magnitude, meteor, meteorite,
meteoroid, outer planets, planet, solar system,
star
Which word means a chunk of matter smaller than
an asteroid orbiting the sun?
meteoroid
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Quiz Time! asteroid, comet, inner planets,
light-year, magnitude, meteor, meteorite,
meteoroid, outer planets, planet, solar system,
star
Which word means the four planets closest to the
Sun?
inner planets
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Quiz Time! asteroid, comet, inner planets,
light-year, magnitude, meteor, meteorite,
meteoroid, outer planets, planet, solar system,
star
Which word means a chunk of matter that burns up
in our sky (atmosphere)?
meteor
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Quiz Time! asteroid, comet, inner planets,
light-year, magnitude, meteor, meteorite,
meteoroid, outer planets, planet, solar system,
star
Which word means the brightness of a star?
magnitude
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Quiz Time! asteroid, comet, inner planets,
light-year, magnitude, meteor, meteorite,
meteoroid, outer planets, planet, solar system,
star
Which word means a small, orbiting body made of
dust, ice, and frozen gases?
comet
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Quiz Time! asteroid, comet, inner planets,
light-year, magnitude, meteor, meteorite,
meteoroid, outer planets, planet, solar system,
star
Which word means unit for measuring distances in
space?
light-year
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Quiz Time! asteroid, comet, inner planets,
light-year, magnitude, meteor, meteorite,
meteoroid, outer planets, planet, solar system,
star
Which word means a giant sphere of glowing gases?
star
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Quiz Time! asteroid, comet, inner planets,
light-year, magnitude, meteor, meteorite,
meteoroid, outer planets, planet, solar system,
star
Which word means a star and all the bodies in
space that revolve around it?
solar system
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Quiz Time! asteroid, comet, inner planets,
light-year, magnitude, meteor, meteorite,
meteoroid, outer planets, planet, solar system,
star
Which word means a small, rocky object that
orbits the Sun?
asteroid