milkyway - Test 3 results Clicker Question DC Grades posted...

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Test 3 results Grades posted in mastering astronomy End of the Semester approaches - make sure that your test, clicker and homework grades are what you think they should be on MA A B C D F Clicker Question: Which of the following properties CANNOT be associated with a black hole? A: Mass B: Spin (angular momentum) C: Composition D: Charge Clicker Question: What is a planetary nebula? A: A hot ionized region around a planet. B: A hot ionized region around a neutron star. C: A hot ionized region around a white dwarf. D: A hot ionized region around a black hole. 3 Clicker Question: Cool stars can be very luminous if they are: A: dense B: large C: small D: close to our solar system Clicker Question: Molecules, like CO, in the interstellar medium radiate mostly at what frequencies? A: in X-rays B: in the visible C: in the infrared D: in the radio
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We can observe emission from molecules. Most abundant is H 2 (don't confuse with H II), but its emission is extremely weak, so other "trace" molecules observed: CO (carbon monoxide) H 2 O (water vapor) HCN (hydrogen cyanide) NH 3 (ammonia) etc. . . These emit photons with wavelengths near 1 mm when they make a rotational energy level transition. Observed with radio telescopes. The Milky Way Galaxy a b c d Artist's Conception Take a Giant Step Outside the Milky Way Example (not to scale) Artist's Conception Take a Giant Step Outside the Milky Way Example (not to scale) Supermassive (3 million solar mass) Black Hole at the Galactic Center 12
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from above ("face-on") see disk and bulge
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