Astronomy 101 2023 Test Questions with Complete Solutions

Astronomy 101 2023 Test Questions with Complete Solutions The largest planets also have the largest densities. - Answer-False The total mass of all the planets is mich less than the mass fo the Sun. - Answer-True Asteroids were recently formed by the collision and breakup of an object orbiting in the asteroid belt. - Answer-False Most comets have short periods and orbit close to the ecliptic plane. - Answer-False The solar system is of largely uniform composition. - Answer-False Astronomers have no theoretical explanation for the "hot Jupiters" observed orbiting some other starts. - Answer-False If we were to construct an accurate scale model of the solar system on a football field with the Sun at one end and Pluto at the other, the planet closest to the center of the field would be (a). Earth (b). Jupiter (c). Saturn (d). Uranus - Answer-(d). Uranus In the leading theory of solar system formation, the planets (a). were ejected from the Sun following a close encounter with another star. (b). formed from the same flattened, swirling gas cloud that formed the Sun. (c). are much younger than the Sun. (d). are much older than the Sun. - Answer-(b). formed from the same flattened, swirling gas cloud that formed the Sun. Asteroids, meteoroids, and comets are remnants of the early solar system. - Answer-True The solar system is differentiated because (a). the heavy elements in the outer solar system sank to the center. (b). the light elements in the inner solar system fell into the Sun. (c). the light elements in the inner solar system were carried off as comets. (d). only rocky and metallic particles could form close to the Sun. - Answer-(d). only rocky and metallic particles could form close to the Sun. Water on Earth was (a). transported here by comets. (b). accreted from the solar nebula. (c). produced by volcanoes in the form of steam. (d). created by chemical reactions involving hydrogen and oxygen shortly after Earth formed. - Answer-(a). transported here by comets. The number of confirmed exoplanets is (a). less than 10. (b). roughly 50. (c). more than 500. (d). more than 5000. - Answer-(c). more than 500.