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

how many stars are in the galaxy

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.

Our Sun is one star among billions of stars in the Milky Way. However, it is difficult to determinethe exact number of stars. By observing the nearby stars around us, you find that the local den-sity of stars is 0.05 stars/(light-year)3. For simplicity, assume that the Milky Way has a cylindricalshape with a diameter of 100,000 light-years and a thickness of 1,000 light-years.Use this information to estimate the total number of stars in the Milky Way

Our galaxy contains ________ stars. *1 pointtwo hundred billiontwo hundred trillion starstwo hundred million starsan unknown number of starsThe galaxy(ies) that we can see from New Jersey with the naked eye is*1 pointLarge Magellanic cloudSmall Magellanic cloudAndromedaOuter edges of galaxies containing individual stars, gas, and dust is called *1 pointThe discThe haloThe bulgeThe armsThree main galaxy shapes include ... *1 pointSphericalEllipticalSpiralPinwheelIrregularPeculiarGalaxies contain hot, bright stars that live shorter lives which appear ______ in color and cool dim stars that live longer lives that appear _______ in color.*1 pointyellow, bluered, blueblue, redyellow, redblue, yellowLarger elliptical galaxies can be _________ of lightyears across*1 point1,000's10,000's100,000's1,000,000'sMost galaxies are named ...*1 pointCreatively like "andromeda" or "milky way"By a cataloguing system with letters and numbersAfter the person who discovered themRandomlyElliptical galaxies range from being very spherical, ______, to being very elongated, _____. *1 pointE0, E7E1, E6S, ESome spiral galaxies have a bar in the middle and are called *1 pointBlocked spiralsBarred spiralsBig spiralsBulky spiralsObserved Irregular galaxies are *1 pointYoungMiddle agedOldSpirals like the milky way are... *1 pointYoungMiddle ageOldSupermassive black holes are commonly found in *1 pointThe older galaxiesThe edges of galaxiesThe centers of galaxiesThe galaxy arms

Most galaxies are classified by ___________.6bb69acb09c21a482cac67fa8c48be2b.webm89 KB acolor and temperature bthe number of stars csize dshape