ASTR 1303 FINAL EXAM 2024 WITH 100% CORRECT ANSWERS

Gravity is an ________ force between two objects with mass, acting along the line between them. - correct answer attractive How many stars are in the Milky Way galaxy? - correct answer 200 billion Newton's first law of motion says that an object at constant velocity will remain at constant velocity unless acted upon by a - correct answer force In his General Theory of Relativity, Einstein revised our understanding of - correct answer gravity Early astronomers believed the earth was at the center of the solar system. This type of solar system model is called - correct answer geocentric A star in the Milky Way galaxy is 50 light years from earth. When we look at the star in the night sky, we see the star as it - correct answer was 50 years ago. An orbit with an eccentricity of zero is a - correct answer circle The time it takes for light to travel from the closest star (other than the sun) to the earth is closest to - correct answer 4 years An object in orbit around earth at constant speed experiences _________ because the direction of the velocity continuously changes. - correct answer acceleration Newton's second law of motion says that a force applied to a mass will cause the mass to - correct answer accelerate As the distance from the Earth to a star increases, the brightness of the star - correct answer decreases