Which of the following best describes the goal of SETI (Search for Extraterrestrial Intelligence)?
A) to detect signals originating from civilizations from outside the solar system
B) to detect life of any kind, anywhere besides Earth
C) to estimate the number of civilizations in the galaxy
D) to find habitable planets around other stars
A) to detect signals originating from civilizations from outside the solar system
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An educated scientific guess is a
A) hypothesis. B) theory. C) either of these D) neither of these
The Crab Pulsar is pulsing in visible light 30 times per second. Why?
A) A jet ejects energy and particles from a hot spot 30 times per second. B) It rotates 30 times per second. C) It is eclipsed by a companion 30 times per second. D) It's a mystery; no one really knows.
One light-hour is the distance light travels in one hour. The speed of light is about 300,000 km/s . How far is 1 light-hour?
A) 300 thousand km (300,000, or 3 × 105 km) B) 1.08 billion km (1,080,000,000, or 1.08 ×109 km) C) 18 million km (18,000,000, or 1.8 × 107 km) D) 9.46 trillion km (9,460,000,000,000, or 9.46 × 1012 km)
What is the approximate latitude of the observer in the diagram below if they are located in the hemisphere containing the south celestial pole?
?
a.
20° N
b.
20° S
c.
70° N
d.
70° S
e.
0°