Almost all stars fall in a mass range ofGroup of answer choices1 to 3 solar masses.0.1 to 20 solar masses.0.01 to 100 solar masses.0.001 to 50,000 solar masses.The range of stellar masses is infinite.

Protostars two to eight times the mass of the sun become...*1 pointLow mass starsIntermediate mass starsHigh mass starsBrown dwarfs

If each galaxy contains 1 hundred billion stars, and there are 1 hundred billion galaxies, and 89% of all stars are low mass like the Sun, and 1 in 5 low mass stars like the Sun have planets like Earth in the habitable zone, what is the number of planets that exist in the Universe that are in the habitable zones of their low mass stars? (hint: use your favorite, dimensional analysis! try this on paper!)  Start with 1 Universe, then convert to galaxies and so on. (For 89% use this conversion factor: 89 low mass stars /100 stars)*1 point4.88 x 10^28 planets2.99 x 10^18 planets8.93 x 10^15 planets1.78 x 10^21 planets

Most of the mass of the Milky Way seems to exist in the form ofGroup of answer choicespopulation II stars in the Halo.the black hole in the Galactic Center.hydrogen gas in the disk and spiral arms.dark matter out in the Halo.population I stars in the disk.

The stars with masses comparable to our Sun's, but sizes like the earth areGroup of answer choicesblue main sequence stars.neutron stars.red main sequence stars.white dwarfs.red giants.

how many stars are in the galaxy