cosmologyfinal

The temperature of the sun's core

what are sunspots

what do we learn about the solar interior from solar seismology

what is the photosphere

the sun's corona ejects a solar wind of particles. which partic les

the rainbow of colors (wavelengths) emitted by the sun is an absorption specturm. how can we tell which elements are found in the sun

Which stars spend the shortest time on the main sequence

if a star that is 30 pc away from us has apparent magnitude of 7, would the star's absolute magnitude be greater or smaller than 7

stars motion away and toward us are measured differently than motions across our field-of-view. what technique is most used to measure the speed of a star moving away from us?

some stars finish the main sequence in a few million years while others are not finished the main sequence after 10 billion years. which finish the main sequence first?

what describes a spectral binary pair of stars

variable stars periodically change their brightness. Cepheid variable, (CV) absolute magnitude is related to the period of variability. CV's are useful in determining the star's

the most intense wavelength (color) of a main sequence star is, inversely proportional to the star

blue giant stars have huge very hot core and fuse fast. why does main sequence fusion take place only in the core

if a cluster of stars has only 100-1000 stars, loosely held together by gravity, in the disk of our galaxy, and each contains many elements (like our sun) then it is a

how do stars form

what describes premain sequence not yet stable stars, sometimes with variable erratic intensity or jets?

what is the nature of the process that causes stars to radiate heat and light for millions or billions of years?

what is a brown dwarf?

why are binary stars so common

what happens to cause a star to become a red giant

what happens inside a red giant

what causes the balance between thermal expansion and gravity to fail in a red giant

how were earths heavy elements created

a planetary nebula is misnamed because it has nothing to do with planets. where does a planetary nebula come from?

describe a white dwarf

after the red giant phase, if the stellar core retains less than 1.4 solar masses, the result will be a

a spectacular supernova 1a increases in brightness by 20 magnitudes (a factor of a hundred million) what could cause this kind of supernova

the core of an imploding type II supernova could become

how do we know that the crab nebula is a supernova remnant

what stops the gravitational implosion of a neutron star?

if neutron stars are too small to be seen, how can we observe them

if a star collapses and the core has 8 or more solar masses, what prevents heat and light and gas from escaping from the collapsed black hole?

How would we recognize the presence of a black hole

the schwarzchild radius is 3km/solar mass. what is the even horizan

assume very large uniform cloud rolled up long ago into a massive blue giant star, passing through a red giant stage to form a black hole. what is the maxiumum amount of mass (in solar masses) a black hole could have?

where are the disk stars in the spiral arms of our galaxy going?

only ancient (old red) stars illuminate which region of the milky way

an open cluster of stars often is found in regions of ionized gas, with some O & B stars. how many stars are in an open cluster

in what band is there extreme high energy radiation from the center of the galactic nucleus?

the region between the stars is filled with

if we see a blue nebula near a blue star, what kind of nebula is it?

what is interstellar reddening

describe a globular cluster

since small amounts of carbon monoxide, co are easily detected, we use CO measurements to help identify regions of the most common gas

the most distinguishing features of galaxies are

individual stars are so far apart (compared to their size that collisions are very unlikely. compared to the size of galaxcies, the distance between the centers of galaxies in a cluster...

explain a starbust galaxy

large spiral galaxies near us are likely to have this at their core.

what can an active galaxy have than an ordinary galaxy doesn't have

double-lobed radio structures, exceptionally bright nuclei (in radio & xray) and very high doppler recession velocities are often features of active galaxies and also

how is a quasar different than an active galaxy? only quasars have

three demensional plots of thousands of clusters galaxies show structure that looks like

hubbles law says

if our galaxy rotates once every 230 million years, how do we detect this motion

on the pitch fork diagram of galaxies, spiral galaxies are classified by

what measurements are best for mapping quasars?

what is a quasar

quasars are relatively small objects to radiate so much energy. why isnt a quasar seen in our huge galaxy?

which best describes gravitational lensing

how do we know that the universe was different billions of years ago