Which of the following is true of early astronomers?
A) They knew that there were many other galaxies in the Universe.
B) They thought the entire Universe consisted of Earth, the Sun, the Moon, and five other planets.
C) They knew that the planets were made of rock and gas, much like Earth.
D) They thought that stars were other objects like the Sun and that we lived inside a galaxy.
B
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Our solar system is in the Galactic ________ of the Milky Way Galaxy
Fill in the blank(s) with correct word
Which element is the dead end for cores of the most massive stars?
A) lead B) oxygen C) uranium D) hydrogen E) iron
The air inside a bicycle tire pump has 60 joules of work done on it as 20 joules of heat is conducted away from it. What is the change in internal energy of the air?
Heating the air in a hot air balloon reduces the air's _________
Fill in the blank(s) with correct word