E.E. Barnard contributed to the understanding of our galaxy by________. all of these are correct counting more stars than William Herschel. systematic study of variable stars completing a photographic study of details of dark dust clouds in plane of galaxy

Answered: E.E. Barnard contributed to the…

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2. A galaxy cluster has a galaxy behind it whose image we see as being smeared out and curved, with an angular radius of curvature on the sky of θE. The background galaxy is at redshift zgal and the cluster is at zclust. What is the mass of the cluster in solar masses? Give your response in scientific notation with one decimal place. (The Hubble constant is of course 70 km/s/Mpc, and you can assume the Hubble law for these low redshifts). Values: zgal = 0.11 zclust = 0.07 θE = 117.4 arcseconds
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38. Many RR Lyrae stars are found in open clusters in the plane of the galaxy. True False
The first evidence for the dark energy was that: a. galaxies in clusters are moving too rapidly for the clusters to be bound. b. Cepheid variable stars showed that galaxies were farther away that thought. c. the cosmic microwave background spectrum was a perfect black body. d.Type Ia supernovae appeared dimmer than predicted by Hubble’s law. e.Einstein’s theory of gravity predicted that the Universe should collapse.
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What objects did Harlow Shapley use to figure out the extent of the Milky Way Galaxy and the location of its center? A. thick clouds of cold hydrogen giving off 21-cm radiation B. globular clusters C. HIl regions D.dust clouds E. gamma-ray bursts
Of the following groupings of galaxies, the one that is largest in size is the a. Local Supercluster. b. Local Group. c. filaments and voids. d. Coma Cluster.

		all of these are correct
		counting more stars than William Herschel.
		systematic study of variable stars
		completing a photographic study of details of dark dust clouds in plane of galaxy