ASTR 100|62 Exam 1Questions And Answers

2.9x10^7 is the same as - ️️29 million A galaxy contains - ️️Large amounts of gas, dust, and stars A hypothesis becomes a theory when - ️️repeated testing of its predictions does not disprove it. A solar eclipse that occurs when the moon's umbra does not reach Earth's surface is called an - ️️Annular solar eclipse A solar or lunar eclipse will occur when? - ️️any time the moon is new or full and near node According to Newton's laws, how does the amount of gravitational force on Earth by the Sun compare to the amount of gravitational force on the Sun by Earth? - ️️The amount of force on the Sun by Earth is the same as the amount of force on Earth by the Sun. An astronaut in free space (away from all objects) whirls a ball on a string in circular motion. If she cuts the string, the ball will - ️️move away from her hand along a tangent in a straight line An empirical science is one that is based on - ️️observed data An observer in the Northern Hemisphere watches the sky for several hours. Due to the motion of Earth, this observer notices that the stars near the north celestial pole appear to move - ️️counter clockwise Based on the length of a lunar cycle, if there is a spring tide today, how long will it be until the next spring tide? - ️️Two weeks Consider the tidal force at the Earth's North Pole due to the Moon. The tidal force is pointed - ️️directly toward the center of the Earth During the night, the stars move generally - ️️Westward Earth is closest to the sun when the northern hemisphere experiences what season? - ️️Winter How did kepler's first law of planetary motion alter the copernican system? - ️️It changed the perfect circles to ellipses and it placed the sun at one focus of each orbit How did Nicolaus Copernicus account for the retrograde motion of the planets? - ️️Inner planets orbit the sun faster and pass outer planets as they orbit around the sun.