Evidence shows that interstellar bodies are moving away from Earth, some faster than others, which BEST suggests that the univer
se A) is shrinking.
B) is expanding.
C) was not formed by a big bang.
D) has always been the same size.
Our Solar System is in the Milky Way galaxy. What shape is this galaxy?
A) oval
B) rectangular
C) spiral
D) triangular
Our solar system lies in
A) the central ring of the Milky Way.
B) one of the spiral arms of the Milky Way.
Eliminate
C) in the galactic center of the Milky Way.
D) outside the spiral arms of the Milky Way.
1. B it's expanding. 2. c Our galaxy, the milky way is a spiral galaxy. you can by looking at it's spiral shape. 3. b We are in one of the Milky way's spiral "arms".
The invariant mass of an electron is approximately9. 109×10−31 kilograms, or5. 489×10−4 atomic mass units. On the basis of Einstein's principle of mass–energy equivalence, this mass corresponds to a rest energy of 0.511 MeV.
Check attachment for further solution to the exercise.
