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Earth's orbit: Quiz


Question 1:
When was the Earth's orbit?
January 2010
11th century

Question 2: Heliocentrism is the theory that the sun is at the center of the ________.
EarthPlutoSolar SystemPlanet

Question 3: ________ -an orbit of any object orbiting the Earth, such as the Moon or artificial satellites
Orbital mechanicsGeosynchronous orbitInclinationGeocentric orbit

Question 4: In astronomy, the Earth's orbit is the motion of the ________ around the Sun, at an average distance of about 150 million kilometers, every 365.242199 mean solar days (1 sidereal year).

Question 5: Earth, along with the Solar System, is situated in the ________ galaxy, orbiting about 28,000 light years from the center of the galaxy, and about 20 light years above the galaxy's equatorial plane in the Orion spiral arm.
Galactic CenterMilky WayLocal GroupVirgo Supercluster

Question 6: In the 16th century, Nicolaus Copernicus's De revolutionibus presented a full discussion of a heliocentric model of the universe in much the same way as Ptolemy's ________ had presented his geocentric model in the 2nd century.

Question 7: Because of the ________ of the Earth (often known as the obliquity of the ecliptic), the inclination of the Sun's trajectory in the sky (as seen by an observer on Earth's surface) varies over the course of the year.
Axial tiltMoonJupiterMars

Question 8: The ________ (gravitational sphere of influence) of the Earth is about 1.5 Gm (or 1,500,000 kilometers) in radius.
Retrograde motionNeptuneHill sphereLagrangian point

Question 9: Above the ________, an extreme case is reached where there is no daylight at all for part of the year.
70th parallel north65th parallel north60th parallel northArctic Circle

Question 10: (This is called a polar night.) This variation in the climate (because of the direction of the Earth's axial tilt) results in the ________.
Precipitation (meteorology)SeasonSpring (season)Weather


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