What is the approximate diameter of the Milky Way Galaxy in light-years?
A. 100
B. 10
C. 100,000
D. 1,000,000
E. 1,000
Answer: C
Physics & Space Science
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In the proton-proton cycle, the positron is
A) massless. B) a spin conservation particle. C) an anti-electron. D) the chief means energy reaches the photosphere. E) intermediate between the proton and neutron in mass.
Physics & Space Science
A(n) ____________________ is used to measure the brightness and color of stars
Fill in the blank(s) with correct word
Physics & Space Science
The Moon is thought to be
a. older than Earth. b. the same age as Earth. c. younger than Earth. d. infinitely old.
Physics & Space Science
Which of the following is an irregular galaxy that can be seen from the Southern Hemisphere?
a. The Crab Nebula b. The Sagittarius Dwarf c. The Small Magellanic Cloud d. The Horsehead Nebula
Physics & Space Science