Science Questions
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O stars must be formed in spiral arms because _____.a.they are only found in spiral arms their gravitational forces takes them to that locationb.they do not live long enough to move out of the armc.they are left behind and found in the region behind the spiral armd.the dust clouds they form from are only found theree.all stars are formed in spiral arms
The center of our galaxy contains a very intense source of radio and X-ray radiation named Sgr A*. What is it about this source that supports the idea that the radiation comes from a black hole?a.Only radiation from a black hole could penetrate the giant molecular clouds between Sgr A* and Earth.b.The radiation is strongly redshifted indicating that the object is growing.c.The radiation is coming from an incredibly small object.d.The radiation is strongly blueshifted, indicating that the object is collapsing.e.Radio waves can only be produced by matter orbiting a black hole.
The best explanation for the activity at the center of the galaxy is a(n) ____.a.giant atomic hydrogen cloud energized into a single, massive emission nebulab.exotic object known as a "magnetar"c.black hole with a mass several million times the Sun'sd.supercluster of O and B starse.black hole with a mass several thousand times the Sun's
What observed feature of the Milky Way is better explained by the bottom-up hypothesis of galactic formation, as opposed to the monolithic collapse model?a.The different metallicities of the bulge and disk of the galaxyb.The supermassive black hole found at center of the galaxyc.The elongated shape of the central bulge of the galaxyd.The difference in age of globular clusterse.The very little gas or dust that halo contains
All of the following are waves that must travel through a medium EXCEPT: a. water wavesb. waves on a stringc. electromagnetic wavesd. sound waves
Who published the first known astronomical observations made with a telescope? a. Galileob. Tychoc. Copernicusd. Kepler
Globular clusters are used as spiral tracers.
The black hole at the center of our galaxy is too large to be the remnant of a single star.
The center of the galaxy has been studied extensively using visible light
Which of these is NOT a form of electromagnetic radiation? a. Radiob. Infraredc. Soundd. gamma rays
A "galactic fountain" is _____.a.a jet of high-speed superheated material thrown out of the accretion disk around a black holeb.a partial spiral arm formed by the collision of molecular cloudsc.a bubble of hot, metal-rich gas ejected from the disk by a burst of supernovad.a stream of gas made from a star that has been torn apart while falling into a supermassive black holee.a stream of gas and dust being pulled into a galaxy as it forms
At the center of our galaxy, ____.a.large stars are formed by the collision of smaller starsb.there is evidence of recent, rapid star formation and supernova explosionsc.there is no star formation since there is no gas presentd.stars form at the same rate as they do in the spiral armse.material is available to make stars but the region is too cold to support star formation
Newton's Law of Gravitation states that the force between two objects a. increases with massb. can be attractive or repulsivec. increases with distanced. depends on the state of matter (liquid, gas or solid)
The central bulge and the galactic disk of the Milky Way are often referred to as its spherical component.
A detached segment of a spiral arm is called a spur.
Examine the accompanying graph (Figure 15-1). Harlow Shapley did not know that there are two categories of Cepheid variables; he was only familiar with those such asdCepheii. Because of this, some of the Cepheid variables he observed ____.a.were RR Lyrae variablesb.had a longer pulsation period than he expectedc.were dimmer than he expectedd.had a shorter pulsation period than he expectede.were brighter than he expected
The vernal equinox marks the beginning of a. winterb. summerc. springd. Fall
Mars. Jupiter and Saturn show retrograde motion because a. Earth moves faster in its orbitb. planets revolve around the Earthc. these planets are closer to the Sun than Earthd. planets move in circular epicycles
Copernicus' model was flawed because a. he didn't know about Uranus and Neptuneb. he assumed planets moved in ellipsesc. he assumed planets were moving in circular orbitsd. he couldn't account for gravity
A total lunar eclipse occurs a. around the time of the summer solsticeb. when the Sun blocks the Moonc. during full moon phased. d. during new moon phase