Astronomy Word Scramble

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Question	Answer
Approximately how far is the Sun from the center of our Galaxy?	8 kpc
What type of object has been proposed to explain the tremendous activity detected at the center of our Galaxy?	A supermassive black hole
Harlow Shapley first located the center of our Galaxy in 1917 by	observing the distribution of globular clusters in the galactic halo
In which constellation in our sky is the center of our Milky Way Galaxy located?	Sagittarius
The Sun's position in the Galaxy is	in the disk of the Galaxy, inside a spiral arm or segment of a spiral arm
The dimensions of the disk of our Milky Way Galaxy are	diameter 100,000 light-years; thickness 2000 light-years
Cepheid variable stars are useful to astronomers as indicators of	distance, particularly to nearby galaxies
The factor that misled Herschel into concluding that the stars of the Milky Way were distributed with the Sun at the center of the Galaxy was	interstellar dust, which obscured the more distant stars and thereby localized his observations
Which of the following components of the Galaxy best outline the spiral arms of the Galaxy?	Young O and B stars, dust, and gas
The time for the Sun to orbit the galactic center once in its motion in the Galaxy is	230 million years
What force holds the stars in orbit in spiral galaxies?	Gravity
Which type of galaxy typically contains the least relative amount of gas and dust?	The elliptical
The majority of galaxies in our immediate vicinity (i.e., in the local group) are:	Irregular and small elliptical galaxies
_____ galaxies contain mostly Population II stars; while _____ galaxies contain both Population I and Population II stars	elliptical; spiral
Which type of galaxy has a disk with no spiral arms?	S0
Which type of galaxy has a large elongated nucleus with tightly-wound arms?	Sc
_______ galaxies may contain a few million to few trillion solar masses.	Elliptical
_______________ contains several hundreds of galaxies	A rich cluster
The _____ that is affecting the motion of the Local Group is believed to be a yet unseen _____.	Great Attractor; cluster of superclusters
What is the rotation curve of a galaxy?	It is a graph of the orbital velocities at various distances from the center of the galaxy
What is the evidence for dark matter?	The fact that the rotation curves of most galaxies become flat at large distances from the center
Astronomers believe that the X-ray radiation from the nuclei of active galaxies comes from _____.	from the accretion disk around a massive black hole
Which particular property of the Cepheid variables makes them suitable as standard candles?	Their pulsation period is related to their luminosity
Which of the following is not true of Hubble’s law?	It can be used to estimate the distance of our neighboring M31 galaxy in Andromeda
What value is closer to the presently accepted value of the Hubble constant?	70 kilometers per second per megaparsec
How do astronomers obtain information about the past of the Universe?	By looking at very distant galaxies
Which of the following models of the Universe are consistent with Hubble's law?	Both the Big Bang model and the Steady State model
Which of the following provides the strongest evidence in support of the Big Bang model?	The existence of the cosmic microwave background radiation
Recent measurements indicate that some of the most distant galaxies may have recession velocities lower than predicted by Hubble's law. What are the implications of such a discovery?	he expansion of the Universe is speeding up
Which of the following findings are in agreement with the predictions of the Big Bang model?	The cosmic microwave background radiation, The recession of galaxies, The hydrogen and helium mix found in older stars
Which of the following lists the forms of matter in the order they came to existence in the early Universe?	Quarks, protons, electrons, atoms
he inverse of Hubble's constant (1/H) gives the approximate _____.	age of the Universe
Recent measurement of the variations of the cosmic background radiation suggest that the curvature of the Universe is ______.	flat (i.e., no curvature)
According to the Big Bang model, most of the _____ in the Universe were formed ____.	hydrogen and helium; during the first 3 minutes
Presently, the accepted value for the Age of the Universe is _______	About 14 billion years

Created by: Izzy-Bellz