The correct sequence of spectral type letters from hot on the left to cool on the right is
a. M, K, G, F, A, B, O b. O, B, A, F, G, K, M
c. G, K, M, F, O, B, A d. A, B, O, F, G, K, M
b
Physics & Space Science
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Which of the following terms is given to a pair of stars that we can determine are orbiting each other only by measuring their periodic Doppler shifts?
A) visual binary B) eclipsing binary C) spectroscopic binary D) double star E) none of the above
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We live in the ______________ epoch
Fill in the blank(s) with correct word
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A right triangle has sides 5 m, 12 m, and 13 m. What is the sine of the smallest angle of this triangle?
1.12/5 2.5/12 3.5/13 4.12/13
Physics & Space Science
On average, active galaxies are rare and most are fairly distant from us
Indicate whether the statement is true or false
Physics & Space Science