The dust particles have exactly the same chemical composition as the gases of the interstellar medium
Indicate whether the statement is true or false
FALSE
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Who first noticed that for Cepheid variable stars, there was a direct relation between the luminosity and the period of the variation in their brightness?
a. Henrietta Leavitt b. Edwin Hubble c. John Glenn d. Carl Sagan e. Annie Cannon
An object is placed in front of a convex mirror at a distance larger than twice the focal length of the mirror. The image will appear
A) in front of the mirror. B) inverted and reduced. C) inverted and enlarged. D) upright and reduced. E) upright and enlarged.
A racecar driver steps on the gas, and his racecar travels 20 meters in 2 seconds starting from rest. The acceleration of the racecar is __________
Fill in the blank(s) with correct word
The most basic and irrefutable proof that energy cannot be created out of nothing or completely destroyed is that
a. Newton's laws of motion require it. b. no proof is necessary. Energy is energy. c. no experiments have ever proved the contrary. d. the Sun would long since ceased to shine. e. it would contradict Einstein's relativity.