Early astronomers used models showing that the Earth was at the center of the universe. Why did they feel this was true?
Answer: Observations of the Sun, Moon, and planets fit this model using early observational instruments.
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Ptolemy's model of the universe
a. was heliocentric. b. included elliptical orbits. c. contained epicycles. d. all of the above e. none of the above
Earth's projected orbit on the sky is called the _____________
Fill in the blank(s) with correct word
Gravitational Force: What is the magnitude of the gravitational force that two small 7.00-kg balls exert on each other when they are 35.0 cm apart? (G = 6.67 × 10-11 N ? m2/kg2)
Fill in the blank(s) with the appropriate word(s).
In order to predict whether a star will eventually fuse oxygen into a heavier element, what do you need to know about the star?
A) its luminosity B) its overall abundance of elements heavier than helium C) how much oxygen it now has in its core D) its mass