Which of the following information about gas and dust in the Milky Way Galaxy is incorrect?The recommended time to answer this question is 2.5 minutes.Soru 4YanıtDust grains typically have a diameter of 1 cm - 10 cm.Atomic gas is mostly composed of hydrogen, some helium and a small amount of other elements.Some cold and dense gas clouds may have a molecular structure.Due to the size of the dust grains, the images of the objects behind the dust may darken slightly.Dust grains mainly contain carbon, oxygen and silicon as well as the other elements.

A collection of gas and dust bound together by gravity is called _________. auniverse bnebula cdwarf star dgalaxy

The mass of Dark Matter in the Milky Way Galaxy is roughly;The recommended time to answer this question is 2.5 minutes.Soru 22Yanıtten times the total mass of the Stars.hundred times the total mass of the Stars.one tenth of the total mass of the Stars.one percent of the total mass of the Stars.one thousandth of the total mass of the Stars.

Which of the following indicates dark matter in a galaxy?The recommended time to answer this question is 2.5 minutes.Soru 25YanıtMost stars orbiting the galactic center have similar velocities.The galaxy is brighter than expected.The presence of a bar-like structure in the bulge of the galaxy.The diameter of the disk of the galaxy increases over time.The stars in certain regions of the galaxy appear fainter than they should be.

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

Recall which of the following is made up of the Milky Way, the Andromeda galaxy and a few smaller galaxies. The Interstellar NeighbourhoodThe Local GroupThe Virgo SuperclusterThe universe