1A

Of these which is the closest to us? a. The Moon b. Mars c. The Sun d. The center of the Milky Way e. The closest spiral galaxy

a. The Moon

By the term universe, astronomers mean a. the realm inside the atom b. everything that we can observe c. the system of 200 to 400 billion stars. of which the Sun is one d. the collection of several dozen galaxies, of which the Milky Way is one e. the system of the Sun, its planets and moons, and small pieces of debris that surround it

b. everything that we can observe

The star that provides energy for life on Earth is a. the Milky Way star b. the Sun c. Alpha Centauri d. Beyoncé e. the Moon

b. the Sun

All molecules (like molecules of water or carbon dioxide) are made up of a. very small pieces of duct, from the material that lies between the stars b. two or more atoms c. baby animals that burrow underground d. hydrogen e. groups of stars

b. two or more atoms

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

c. more than one of the above

For scientists, an element (like gold) is defined by a. the value of one pound on the commodities market b. how many neutrons are orbiting its nucleus c. the number of protons in its nucleus d. none of the above e. the number of molecules it can form

c. the number of protons in its nuclues

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

d. the distance that light travels in one year

Which of the following is the Earth NOT located in? a. the Milky Way Galaxy b. the solar system c. the Virgo supercluster d. you can't fool me, we are located in all of the above e. the Local Group of galaxies

d. you can't fool me, we are located in all of the above

Light travels 3 x 10(5 power) meters every second. That number in words is a. 3,105 meters b. 30 meters c. 310 meters d. none of the above e. 300,000 meters

e. 300,000 meters

The natural object (not one that humans built) in space that's closest to Earth is a. The Sun b. Alpha Centauri c. Jupiter d. Mars e. The Moon

e. The Moon

A large body in space that consistently makes its own light (instead of merely reflecting another body's light) is called a. a moon b. a planet c. a light year d. a satellite e. a star

e. a star

The smallest piece of an element (like gold of lead) that still has all the properties of that element is called a. ytterbium b. a neutron c. an electron d. a quasar e. an atom

e. an atom

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. this is still an unsolved problem in astronomy d. the lights in Oconomowoc, Wisconsin are too bright and interfere with our observations e. 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

e. 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