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

Galaxies and stars in space are found in are found in _______ and the emptiness of space is found in _____.*1 pointfilaments, voidsvoids, filamentsgalaxies, spacespace, galaxiesWe are in the _____ galaxy, ________ cluster,  and the _____ supercluster.*1 pointAndromeda, Milky Way, ReesesMilky Way, Local Group, VirgoMilky Way, Andromeda, Local GroupTwix, Virgo, SagittariusSagittarius, Virgo, Away GroupIf 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 planetsWhat is at the center of most galaxies?*1 pointA supermassive black holeA large starA neutron starSagittarius ANothingSelect the following true information about the Milky Way*1 pointSagittarius A is at its centerIt is 13.8 billion years oldIt takes the Sun 225,000,000 years to make its orbit around the galaxyIt is a barred spiral galaxyThe galaxy does not rotateTrue or false, the Milky way is almost a perfect 3D sphere*1 pointTrueFalseMatch the following parts of the Milky Way*4 pointsBulge Disc Halo Blue RegionsMostly young stars, concentrated in the spiral arms Individual stars, globular clusters, dark matter, largest structure in the galaxy Really old stars, gas, dust New star formation from gas and dust Mostly young stars, concentrated in the spiral arms Individual stars, globular clusters, dark matter, largest structure in the galaxy Really old stars, gas, dust New star formation from gas and dust True or false, the Hubble Classification of galaxies shows the evolution of galaxies*1 pointTrueFalseThe difference between spiral and barred spiral galaxies is that...*1 pointBarred spiral rotatesBarred spiral has a bar in the middleSpiral has fewer armsSpiral is distinguished on how tightly wound the arms areE7 are ____ than E0 galaxies.*1 pointsmallerroundermore oblongedStars in elliptical galaxies move with...*1 pointorderly arrangementa spiral shapechaotic motionLenticular galaxies are hybrids between ______ and _____*1 pointLenticularPeculiarSpiralIrregularEllipticalThe difference between irregular and peculiar galaxies is that*1 pointPeculiar has no distinct shapeIrregular is made from collisions of galaxiesPeculiar have a active galactic nucleus

A galaxy is best described asa region in space between the orbits of Mars and Jupitera formation composed of billions of starsa type of solar systema constellation visible to everyone on Earth

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

how many stars are in the galaxy

Most galaxies are named ...*1 pointCreatively like "andromeda" or "milky way"By a cataloguing system with letters and numbersAfter the person who discovered themRandomly