1
Q
Nebula
A
a large cloud of gas and dust in interstellar space; a region in space where stars are born or where stars explode at the end of their lives
2
Q
Solar Nebula
A
the cloud of gas and dust that formed our solar system
3
Q
Nuclear Fusion
A
the combination of the nuclei of small atoms to form
a larger nucleus; releases energy
4
Q
Sunspot
A
a dark area of the photosphere of the sun that is cooler than the surroundng areas and that has a strong magnetic field
5
Q
Astronomical Unit
A
the average distance between te Earth and the sun; approximatley 150 million kilometers
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Science
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