Answer:
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The mass of moon is 1/100 times and its radius 1/4 times that of earth as a result the gravitational attraction on the moon is about one sixth when compared to earth.
a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
The change of color. Each color has a different wavelength therefore a different frequency.
The first human made object made to orbit earth was the Soviet Union's Sputnik 1, it launched the 4th of October 1957.