The sweep technique used in SETI programs is also known as a
A) targeted search
B) intentional search
C) sky survey
D) random search
C
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The Magellanic Clouds are good examples of the ________ type of galaxy
Fill in the blank(s) with correct word
A tiger is running in a straight line. If we double both the mass and speed of the tiger, the magnitude of its momentum will increase by what factor?
A) 8 B) 4 C) D) 16 E) 2
A positron and its antiparticle, the electron, can annihilate each other and produce
A. high-energy photons. B. green electrons and anti-green electrons. C. protons and antiprotons. D. quarks and antiquarks.
How big is the universe? You calculated the radius of the Hubble Volume (the observable universe) in Procedure 3 . Is it possible to calculate the radius of the entire (everything that is) universe? Justify your answer. (Hint: Consider the expansion rate.)