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42 Cards in this Set

  • Front
  • Back
A small body which orbits the sun between Mars and Jupiter.
Asteroid
A bright heavenly body made up mostly of a group of particles of rock, metals, and frozen water.
Comet
The distance light travels in one year.
Light-year
Stony or stony-iron particles that enter the earth's atmosphere with enormous speed and are called shooting stars.
Meteor
The sun is a ________ star.
Medium-sized star
The sun contains about ____ percent of the mass of the solar system.
99
The sun contains mainly of these two gases.
Hydrogen and Helium
Energy is produced in the sun through the process of _________.
Nuclear fusion
The surface temperature of the sun is normally about _______.
10,000 degrees F.
The various kinds of activity on the surface of the sun are called solar activity.
True
Sunspots appear on the sun's surface because the surface temperature in these areas is _______.
Cooler
Spectacular eruptions of hot gases from the sun's surface are called_________.
Prominences
Solar flares on the sun produce x-rays, radio waves, and clouds of atomic particles.
True
Atomic particles from the sun in the earth's atmosphere can produced the northern and southern lights.
True
Planets are objects that orbit the sun and are not moons (or satellites) of another object.
True
Pluto is always the most distant heavenly body from the sun.
False
Mercury and Venus do not have moons, but the rest does.
True
The four planets are called ______ planets.
Terrestrial
All of the giant planets have rings around them.
True
A ________ is a meteor or meteor fragment that impacts the earth's surface
meteorite
Small irregular shaped objects which orbit the sun are called ________.
asteroids
Asteroids are usually found orbiting between _________ and _______.
Jupiter and Mars
Many thousands of asteroids occur in the solar system.
True
The largest known asteroid is called _______.
Ceres
The asteroid Ceres is about ______ miles in diameter.
567
Small bodies which enter the earth's atmosphere and burn up are called what?
meteors
Clumps of dust and gas which revolve around the sun are what?
comets
The orbits of the comets are usually highly elongated.
True
All activity on the sun's surface is called solar activity.
True
Sunspots rarely appear in groups.
False
Neptune is the outermost planet from the sun.
True
Some asteroids do not lie in the asteroid belt.
True
The sun is composed primarily of _________ and ___________.
hydrogen and helium
Comets orbit in a short, circular paths around the sun.
False
Halley's comet takes 5 years to complete an orbit.
False
Meteors are meteoroids that hit the earth.
False
Earth rotates west to east.
True
What is the correct order of the planets?
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
The cooler temperature of sunspots is caused by a _________.
Magnetic field
The sun rotates on its axis once every _____________.
25 days 9 hours
Long-period comets take ________________ to orbit the sun.
200 or more years
About 500 meteorites reach the earth each year.
True