Asteroid impacts large enough to cause mass extinction on Earth occur roughly once every 100 million years. Use that fact to estimate the probability that such an event will occur in your lifetime, which you can take to be approximately 100 years. What's your estimate of that probability?
A) 1 in 100,000,000
B) 1 in 10,000
C) 1 in 1,000,000
D) 1 in 100,000,000,000
C) 1 in 1,000,000
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Discuss how Harlow Shapley determined the structure of the Milky Way galaxy from his study of globular clusters
What will be an ideal response?
What are the most common type of meteorite?
a. chondrites
b. chondrules
c. iron meteorites
d. carbonaceous chondrites
e. calcium-rich carbonites
Both protons and neutrons (and their anti-particles) froze out:
A) after 10-43 seconds, at the Planck Era. B) at 1032 K, at the end of the Inflationary Era. C) at 1013 K, about .0001 seconds after the Big Bang. D) after about a minute of expansion. E) about 50,000 years after the Big Bang.
Most comets spend the majority of their time beyond the orbit of ________, yet many of them have perihelions very close to the Sun
Fill in the blank(s) with correct word