Stars are powered by ________
Fill in the blank(s) with correct word
nuclear fusion
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What evidence is there that Earth has been struck by large meteorites?
What will be an ideal response?
The search for black holes involves searching for
a. single stars that emit large amounts of X-rays. b. X-ray binaries where the compact companion has a mass in excess of 3 . c. large spherical regions from which no light is detected. d. pulsars with periods less than one millisecond. e. pulsars that are orbited by planets.
Why were Galileo's telescopic observations of the phases of Venus critical evidence in favor of the Copernican theory?
What will be an ideal response?
In the heliocentric model, the retrograde motion of the planets was explained as the consequence of the different orbital speeds of the planets, without the use of epicycles.
Answer the following statement true (T) or false (F)