THE SOUTHWORTH PLANETARIUM 70 Falmouth Street Portland, Maine 04103 (207) 780-4249 usm.maine.edu/planet 43.6667° N 70.2667° W Altitude: 10 feet below sea level Founded January 1970 2021-2022: LXV "Look deep into nature and then you will understand everything better." -Albert Einstein THE DAILY ASTRONOMER Friday, January 14, 2022 Quiz # 15: Stars Now that we've celebrated the arrival of another new year, we can now offer a simple astronomy quiz about well, what else, stars! You know, those luminescent pinpricks adorning our night sky. A lovely bit of astronomy to conclude our week. Enjoy! *1. ______________ is the closest star system to the Sun* a. Sirius b. Alpha Centauri c. Ross 236 d. Procyon *2. _____________ is the brightest star in the night sky* a. Sirius b. Betelgeuse c. Alpha Centauri d. Sun 3. Luminosity measures the amount of energy a star produces __________ a. per second b. per minute c. per hour d. per year 4. *Every second the Sun fuses about ____________ tons of hydrogen.* a. 10,000 b. one million c. 50 million d. 647 million 5. *A star's absolute magnitude is directly related to the star's ___________________.* a. distance b. luminosity c. size d. temperature 6. *The more massive a star is at birth the_________ it will be.* a. more long lived b. more luminous c. redder d. metal rich 7. * If star A's radius is 3 times that of star B, how much larger is A than B in terms of volume?* a. 3 times b. 9 times c. 27 times d. 81 times *8. Approximately _______________ stars are visible to the unaided eye throughout the night.* a. 2,000 b. 4,500 c. 7,100 d. 10,000 *9. Approximately _____________ stars are born every second throughout the Universe.* a. 1,200 b. 2,400 c. 4,800 d. 9.600 *10. In what year was the first star set into place on Hollywood's Walk of Fame?* a. 1948 b. 1953 c. 1957 d. 1960 ANSWERS *1. ______________ is the closest star system to the Sun* b. Alpha Centauri At a distance of 4.37 light years, the triple star system Alpha Centauri is the closest star system to the Sun. It is only visible south of the 30th north parallel. *2. _____________ is the brightest star in the night sky* a. Sirius 3. Luminosity measures the amount of energy a star produces __________ a. per second 4. *Every second the Sun fuses about ____________ tons of hydrogen.* d. 647 million *5. A star's absolute magnitude is directly related to the star's ___________________.* b. luminosity 6. *The more massive a star is at birth the_________ it will be.* b. more luminous 7. * If star A's radius is 3 times that of star B, how much larger is A than B in terms of volume?* c. 27 times A sphere's volume is proportional to the cube of its radius. If star A's radius is three times greater than star B, its volume will be 3 x 3 x 3 = 27 times greater than star B. *8. Approximately _______________ stars are visible to the unaided eye throughout the night.* d. 10,000 *9. Approximately _____________ stars are born every second throughout the Universe.* c. 4,800 We add a night's sky worth of stars to the cosmos every 2.1 seconds *10. In what year was the first star set into place on Hollywood's Walk of Fame?* d. 1960 See you on Tuesday! Enjoy the weekend. To subscribe or unsubscribe from the Daily Astronomer: https://lists.maine.edu/cgi-bin/wa?SUBED1=DAILY-ASTRONOMER&A=1