A star on the red giant branch has a core about the size of ________
Fill in the blank(s) with correct word
the Earth
Physics & Space Science
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Which of the following makes a meson?
a) a photon and a graviton b) an up quark and an anti-down quark c) three up quarks d) a charm quark and a strange quark e) two down quarks and an anti-up quark
Physics & Space Science
Which is the densest planet in the solar system?
A) Mercury B) Venus C) Earth D) Mars E) Jupiter
Physics & Space Science
The equivalent capacitance of the circuit shown below is
a.
0.2 C.
b.
0.4 C.
c.
1 C.
d.
4 C.
e.
5 C.
Physics & Space Science
Although the entire universe may be much larger than our observable universe, we can see only within our observable universe. The "boundary" of our observable universe is called ________
A) the lookback time B) the Hubble Deep Field C) the cosmological horizon D) the Big Bang
Physics & Space Science