What was Cecilia Payne's discovery?
A. She showed how to calculate the level in which an atom's electrons were most likely to be found.
B. She proved that stars are composed mainly of hydrogen.
C. She classified stellar spectra by temperature.
D. All of these choices are correct.
Answer: B
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During Earth's third stage of development, flooding, began as _______________ continued to heat Earth's interior and caused rock to melt in the upper mantle
Fill in the blank(s) with correct word
The name of which astronomer is most closely linked with that of Ejnar Hertzsprung?
a. Johannes Kepler b. Henrietta Leavitt c. Henry Russell d. Edwin Hubble
An object is placed 15 cm in front of a concave mirror with a focal length of 30 cm. What is the magnification?
a. 1 b. 2 c. 1/2 d. 1/4 e. -2
The central core inside an atom is the
a. electron b. proton c. neutron d. nucleus e. none of the above