Which has a larger mass, a liter of water or a liter of mercury (a liquid metal)?
a. mercury
b. water
c. none of these
a
Physics & Space Science
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It is believed that ring galaxies form
a. when two galaxies collide at high speeds. b. when two spiral galaxies collide, but not directly head on. c. from a large cloud of gas and dust with very little angular momentum. d. from a large cloud of gas and dust with a very high angular momentum. e. when more than two galaxies collide at the same time.
Physics & Space Science
The Sun is located at the edge of the galaxy, approximately 50,000 light-years from the galactic center
Indicate whether the statement is true or false
Physics & Space Science
A ________ is a place where the current rules fall apart in science
Fill in the blank(s) with correct word
Physics & Space Science
Which of these shows one cycle of the wave?
a. 
b. 
c. 
d. 
Physics & Space Science