What did Democritus do?
Answer: He was a Greek philosopher who is the father of modern atomic thought and proposed that matter couldn't be divided into smaller pieces. He said that matter was made of small, hard particles called atoms.
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The surface of the sun seems to be about 10,000ºF. What would you guess the rate of heat emission from the sun to be for an area of the sun that measures 1 ft^2?
Fill in the blank(s) with the appropriate word(s).
Which of the solar system objects listed below is most similar to Earth in terms of mass and density?
a. Mercury b. Moon c. Venus d. Mars e. Deimos
A lunar eclipse that occurs when the Moon moves completely into Earth's umbral shadow is called
a. a total solar eclipse. b. a partial solar eclipse. c. an annular eclipse. d. a penumbral lunar eclipse. e. a total lunar eclipse.
The core of the Sun is at a temperature of about 20,000 K
Indicate whether the statement is true or false