Constellations and designations of stars

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Presentation transcript:

Constellations and designations of stars Constellation = random collection of stars (figure)   Stars’ names: Greek letter + constellation name Orionis (= Betelgeuse)  Orionis ( No special name)  Canis Majoris (= Sirius)   

More star names Find: Leporis Geminorum Tauri A few distances: Canis Maioris - 9 ly  Canis Maioris - 500 ly  Canis Maioris - 1,800 ly Canis Maioris - 430 ly 95% of the 6,000 naked-eye stars are at 50 to 500 ly: in the solar neighborhood. Inside Taurus!

Questions coming …

sec 8 9 10 12 11 7 6 1 2 3 4 13 30 35 40 45 14 25 16 15 18 17 19 20 5 Question 13 Which constellation is closer to us, and how do we know? A The Big Dipper is closer than Orion because the Big Dipper looks larger in the sky. B Orion is closer than the Big Dipper because Orion’s stars look brighter in the sky. C All constellations are at the same distance. D This question is nonsense because constellations are not real objects. E This question is nonsense because the distance to constellations changes as Earth revolves around the Sun. Next question coming …

sec 10 9 11 12 15 14 13 8 7 1 2 3 5 4 6 16 26 17 27 28 30 29 24 25 23 19 18 20 21 22 Question 14 What is  Canis Maioris? A The name of a bright star. B The name of a planet. C The name of a constellation. D A galaxy. E The name of a moon revolving around the planet  Canis Maioris. Next question coming …

sec 10 9 11 12 15 14 13 8 7 1 2 3 5 4 6 16 26 17 27 28 30 29 24 25 23 19 18 20 21 22 Question 15 The Pleiades (the “Seven Sisters”) is … A A constellation. B A star. C Not a constellation, but it is a star cluster inside the constellation of Taurus. D A constellation, which is the same thing as a star cluster. E A collection of seven random stars, unrelated to each other. Next question coming …

Question 16 sec 8 9 11 12 7 10 4 1 2 3 6 13 45 25 30 35 14 19 15 16 17 18 40 20 5 Most of the stars visible in the sky by the naked eye are … A outside the Galaxy. B inside the Galaxy, but not necessarily in the vicinity of the Sun. C inside the Galaxy, and mostly in the vicinity D 50% inside the Galaxy, 50% outside. E nowhere close to the Galaxy, which is much farther away from us than the individual stars in the sky are.