FREE AND STUDY GAMES ABOUT LAST PHYS TEST EXAM

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FREE AND STUDY GAMES ABOUT LAST PHYS TEST EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -163 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: is a cluster of galaxy groups and clusters

Answer:

supercluster Question 2: 6. What evidence is there for dark matter on the scales of galaxies and clusters of galaxies?

Answer:

Flat rotation curve in clusters and gravitational arc Question 3: 19. What important discovery was made in 1998 that revolutionized our thinking regarding the expansion of the Universe?

Answer:

Dark energy

Question 4: an unseen component of matter

• this is now known as .......

Answer:

dark matter

Question 5: The Local Group is dominated by two giant galaxies

Answer:

the Milky Way

• Andromeda

Question 6: 20. What is the source of energy that powers Active Galactic Nuclei?

Answer:

supermassive black hole

Question 7: Stars in elliptical galaxies orbit in ....... directions

Answer:

random

Question 8: if a spiral galaxy's disk is aligned towards us, it is

called an ....... spiral

Answer:

edge-on

Question 9: A rare but more spectacular event is a ......

Answer:

multiple merger

Question 10: If the rate of deceleration is large enough, the Universe

might eventually stop expanding and begin to collapse

• this scenario is referred to as a bound Universe
• this Universe would presumably end in a

Answer:

Big Crunch

Question 11: The redshift seen in spectra of distant galaxies is due to the

expansion of the Universe, rather than the movement of galaxies through space.? This referred to as a ......

Answer:

cosmological redshift Question 12: 25. What is our present best estimate of the geometry of the Universe?

Answer:

Flat, no curve

Question 13: Like most giant galaxies, the Milky Way has ......

Answer:

satellites

Question 14: The central region of the Milky Way's bulge is called the

......

Answer:

nucleus

Question 15: argued that these spiral nebulae were very distant

Answer:

Heber Curtis

Question 16: If two galaxies of similar size undergo a strong interaction,

they will eventually merge to form a single galaxy.? This type of event is referred to as a

Answer:

major merger

Question 17: A galaxy is held together by the mutual ............

attraction of its stars and other matter

Answer:

gravitational Question 18: The spectra of Seyfert galaxies contain strong ...... due to ionized heavy elements (especially iron)

Answer:

emission lines

Question 19: In fact, on average, redshift (and therefore recession

velocity) is directly proportional to distance In fact, on average, redshift (and therefore recession velocity) is directly proportional to distance ? this empirical relationship is known as

Answer:

Hubble's Law

Question 20: Cepheids can be identified by their ..... of variation

Answer:

periods

Question 21: RR Lyraes are often found in .......

Answer:

globular clusters

Question 22: If ? > 1, the Universe has positive curvature and is

Answer:

finite

Question 23: ........ observations indicate the presence of a bright radio

source, known as Sagittarius A* ? These observations indicate that the nucleus harbors a supermassive black hole with a mass of about 4 million M