ASTRO 7N UNIT 4 PART 1 Quiz -Solved

ASTRO 7N UNIT 4 PART 1 Quiz -Solved According to the models of galaxy formation, which population of stars formed first? - ANSWER-the spheroidal population Compared to spiral galaxies, elliptical galaxies have- - ANSWER-Less gas, redder colors, and less new star formation How do you measure the mass of the supermassive black hole at the center of the Milky Way? - ANSWER-Look at the orbits of nearby stars and apply Kepler's third law In the symbol for the Hubble type of a galaxy, SBc, the "B" denotes- - ANSWER-The presence of a bar In what part of the spectrum are starburst galaxies brightest? Remember: Starbursts are dusty. What does dust do? - ANSWER-infrared What are the differences between open star clusters and globular star clusters? - ANSWER-open clusters are less concentrated, younger, and have fewer stars What does our Galaxy look like? - ANSWER-A. It has a large disk with spiral arms, and is relatively flat and thin

• It has clouds of gas and dust in the spiral arms
• Older yellow stars are found mostly in the center bulge
• Old stars and globular clusters are located in a spherical halo above and below the

disk.

• All of the above

ALL OF THE ABOVE

What happens to the planets in a galaxy when that galaxy collides with another galaxy?

• ANSWER-Nothing, because the spaces between stellar systems in a galaxy is much

larger than their size What is a starburst galaxy? - ANSWER-a galaxy with a very high rate of star formation What is the difference between an E0 and an E7 galaxy? - ANSWER-The E7 has an oval shape and the E0 is circular What is the mass of the black hole at the center of the Milky Way? - ANSWER-4 million solar masses What kind of a gas cloud can collapse and form stars? - ANSWER-The gas cloud must have a mass that exceeds the Jeans mass so that gravity overcomes the internal pressure in the cloud

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