ast 180- ch 1 review

The location of the Earth in the Milky Way Galaxy is A in the center of the Galaxy. B on the edge of the Galaxy as far from the center as you can measure. C a little less than 30,000 light-year from the center. D something astronomers have not yet measured.

C

A star is 230 light years away. The light we see tonight from that star left it A one year ago. B 2.3 years ago. C 23 years ago. D 230 years ago. E the time depends on which part of the sky the star is in.

D

Of these which is the closest to us? A Mars. B The Moon. C The Sun. D The center of the Milky Way. E The closest spiral galaxy.

B

The Astronomical Unit (AU) as defined by astronomers is A a distance of one light year. B the average distance between the Earth and the Sun. C the time it takes for the Earth to orbit the Sun once. D the distance the Earth travels in orbit in one day. E the distance between Congress and the White House.

B

The smallest piece of an element (like gold or lead) that still has all the properties of that element is called A a quasar. B an atom. C an electron. D a neutron. E ytterbium.

B

The star that provides energy for life on Earth is A the Moon. B the Sun. C Alpha Centauri. D the Milky Way. E Beyonce.

B

All molecules (like molecules of water or carbon dioxide) are made up of A hydrogen. B groups of stars. C two or more atoms. D very small pieces of dust, from the material that lies between the stars. E baby animals that burrow underground.

C

Even with the best and largest telescopes, we can't see all the stars in the Milky Way Galaxy, even though these same telescopes can show us other galaxies. Why is that? A Starlight isn't able to travel through black space. B The Milky Way Galaxy turns too quickly. C Dust in the space between stars builds up over large distances and blocks the light of stars behind the dustier parts of the Milky Way. D This is still an unsolved problem in astronomy. E The light pollution is too strong everywhere and interfere with our observations.

C

The way scientists know that a hypothesis in astronomy is a reasonable description of nature is to A take a vote of astronomers around the world. B consult with the oldest experts in the field. C experiments and observations about the predictions of the hypothesis. D count how many scientific papers have been written about it. E look it up in Wikipedia.

C

You are on a camping trip, far away from city lights. You look up into the dark night sky, and see lots of stars, some brighter, some dimmer. All the stars you see with your unaided eye are A in our solar system. B equally close to the Sun. C in the Milky Way Galaxy. D outside the universe. E just reflections of the Sun from a shiny surface beyond Pluto.

C

A light year is A the time it takes light travel between the Sun and the furthest planet. B the time it takes a beam of light to go completely around the Earth's orbit. C the distance between the Sun and the next star. D the distance that light travels in one year. E how long it takes a Friday afternoon class in college to get finished.

D

By the term "universe", astronomers mean A the system of the Sun, its planets and moons, and small pieces of debris that surround it. B the system of 200 to 400 billion stars, of which the Sun is one. C the collection of several dozen galaxies, of which the Milky Way is one. D everything that we can observe. E the realm inside the atom.

D

Of these, which is the largest? A Earth. B The Solar System. C Jupiter. D The Milky Way Galaxy. E The Universe.

E

The laws of nature (as determined by scientists) A are constructed from many observations, hypotheses, and experiments. B apply both on Earth and among the stars. C can never, ever change once they are written down in textbooks. D are often written in the language of mathematics. E more than one of the above.

E

Which of the following is the Earth NOT located in? A The solar system. B The Milky Way Galaxy. C The Local Group of galaxies. D The Virgo supercluster. E You can't fool me; we are located in all of the above!

E