How do scientists estimate how old the solar system is?
A) They measure the speeds and distances of galaxies, and calculate the time it took for them to travel that distance.
B) They make a guess: no one really knows how old the solar system is.
C) They look up the answer in a book.
D) They measure how fast the Sun is losing energy, and how much energy it has to lose.
E) They measure the abundances of radioactive elements in meteorites, and use their half-lives to calculate the age.
E
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Stars of the main sequence all fall in luminosity class ________
Fill in the blank(s) with correct word
Our Solar System:
is centrally positioned in the Milky Way galaxy. formed 10 billion years ago. has a massive, first-generation star at its center. completes one rotation around the center of the Milky Way every 250 million years. All of the above are true.
If you strip electrons from an atom, the atom becomes a
A) positive ion. B) negative ion. C) different element.
Aluminum Rod#1 has a length L and a diameter d. Aluminum Rod#2 has a length 2L and a diameter 2d. If Rod#1 is under tension T and Rod#2 is under tension 2T, how do the changes in length of the two rods compare?
a. They are the same. b. Rod#1 has double the change in length that Rod#2 has. c. Rod#2 has double the change in length that Rod#1 has. d. Rod#1 has quadruple the change in length that Rod#2 has. e. Rod#2 has quadruple the change in length that Rod#1 has.