Why do the constellations that are visible in the sky at night change with the seasons?
A. because the celestial sphere revolves around Earth
B. because Earth revolves around the Sun
C. because Earth rotates about an axis
D. because Earth is a sphere
Answer: B
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A constellation directly overhead at midnight in June will be ________ at midnight in December.
A. on the eastern horizon B. on the western horizon C. directly overhead D. below the horizon E. None of these choices is correct.
A satellite is in an elliptical orbit around Earth. At one point on the ellipse, it is 40 × 106 m from the center of Earth and has a speed of 10,000 m/s. At another point on the ellipse its speed is 9100 m/s
How far from the center of Earth is the second point? The mass of Earth is 5.97 × 1024 kg and G = 6.67 x 10-11 N•m2/kg2. A) 2.9 × 108 m B) 4.3 × 108 m C) 6.7 × 107 m D) 8.6 × 107 m E) 9.1 × 107 m
One of Tycho Brahe's major contributions to astronomy was to prove that ________ was ________.
A. a comet; outside Earth's atmosphere B. a supernova (exploding star); much farther away than the planets C. the Sun; the center of the solar system D. both A and B E. A, B, and C
You are located in Knoxville, TN, United States. Your friend is located in Lima, Peru. You see a waning gibbous moon in your clear night sky. What phase, if any, will your friend see if the night sky in Lima is also clear?