Galaxies
Elliptical!
What method of distance measuring would be most appropriate for stars within 100 pc?
Parallax
What is one piece of evidence that the Universe used to be hotter and denser?
- Galaxies moving away from one another
- CMB
What is the output units for an H-R diagram?
A. Luminosity vs. Power
B. Temperature vs. Time
C. Stellar Type vs Temperature
D. Luminosity vs. Temperature
D. Luminosity vs. Temperature
What is Professor Cole's full legal name?
Chaotic motion of orbits has ejected most of it!
What is the reason why fusion stops at Iron?
Its an energy minimum! You don't get more energy out of it
In the "Bottom up" theory for the universe, what formed first?
Galaxies!
What wavelength range was the CMB originally when emitted?
A. Gamma
B. Visible
C. X-Ray
D. Infrared
D. Infrared
What year did Professor Cole first arrive here at UMD?
1999
Why do AGN typically occur in galaxy mergers?
Mergers = lots of dust infalling towards the center and accretion disk!
What principle dictates degeneracy pressure?
Pauli Exclusion Principle!
Lower Density = more light elements
Collisions!
In the Hertzsprung-Russell (HR) diagram, where would a white dwarf most likely appear?
A. Upper left: Hot and luminous
B. Upper right: Cool and luminous
C. Lower left: Hot and dim
D. Lower right: Cool and dim
C. Lower left: Hot and dim
What is the *full* name of my advisor?
Megan Weiner Mansfield
Why do galaxy halos extend well beyond the reach of the ordinary matter?
DM cannot radiate away energy in the form of light to fall inwards!
Define a standardizable candle:
Has a known luminosity that can be used to extract its distance given a known flux.
Why can we not see further than the CMB?
It is when the universe became transparent and light could travel!
Which of the following features of the Cosmic Microwave Background (CMB) provides the strongest evidence for the existence of non-baryonic dark matter?
A. The overall blackbody shape of the CMB spectrum
B. The tiny temperature anisotropies on large angular scales
C. The pattern of acoustic peaks in the CMB power spectrum
D. The uniformity of the CMB temperature in all directions
C. The pattern of acoustic peaks in the CMB power spectrum
Within 1%, what was the final overall grade I received for ASTR121?
91.5
Why do we sometimes only see 1 jet from AGN?
Relativistic doppler beaming
How far away would the Sun be if with an observed apparent magnitude of 7.2? (It's absolute magnitude is 4.8)
30.2 pc
How does inflation explain CMB uniformity and galaxy pockets?
Pre-inflation universe was small enough to allow equilibrium
Small high density pocket areas become more drastic after inflation
Which of the following observations provides the strongest direct evidence for the existence of dark matter on galactic and cluster scales?
A. The high redshift of quasars compared to nearby galaxies
B. The detection of gravitational lensing effects inconsistent with visible mass distributions
C. The cosmic microwave background's uniform temperature across the sky
D. The observed abundance ratios of light elements such as helium and deuterium
B. The detection of gravitational lensing effects inconsistent with visible mass distributions
Within 1 year, how old was Professor Cole when he entered College?
12