Which of the following explains why we see different constellations at different times of year?
A) Earth rotates once each day.
B) Earth orbits the Sun once each year.
C) The direction of Earth's axis in space precesses with a period of about 26,000 years.
D) Stars appear to move randomly relative to our Sun in the local solar neighborhood.
E) The universe is expanding.
D) Stars appear to move randomly relative to our Sun in the local solar neighborhood.
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After landing on an unexplored Klingon planet, Spock tests for the direction of the magnetic field by firing a beam of electrons in various directions and by recording the following observations: Electrons moving upward feel a magnetic force in
the northwest direction. Electrons moving horizontally toward the north are pushed downward. Electrons moving horizontally toward the southeast are pushed upward. Mr. Spock therefore concludes that the magnetic field at this landing site is in which direction? A) toward the east B) toward the northeast C) toward the southwest D) toward the southeast E) toward the west
Scientists once thought that Earth's primary atmosphere was composed of _____
A) hydrogen and methane B) nitrogen and oxygen C) carbon dioxide and methane D) oxygen and hydrogen
The path of a light ray through a refracting surface is reversible
Indicate whether the statement is true or false