Astronomy

Light travels 3 x 10*5 meters every second. That number in standard notation is?

300,000 meters

What is the closest object to us?

The Moon

A light year is?

the distance that light travels in one year

A star is 230 light years away. The light we see tonight from that star left it?

230 years ago

The natural object (not one that humans built) in space that's closest to Earth is

The Moon

Of these, which is the largest?

The Universe

The location of the Earth in the Milky Way Galaxy is

a little less than 30,000 LY from the center

A large body in space that consistently makes its own light (instead of merely reflecting another body's light) is called?

a star

The laws of nature (as determined by scientists?

all of the above

The smallest piece of an element (like gold or lead) that still has all the properties of that element is called?

an atom

The way scientists know that a hypothesis in astronomy is a reasonable description of nature is to?

do experiments and observations about the predictions of the hypothesis

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?

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

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?

in the Milky Way Galaxy

The star that provides energy for life on Earth is?

the Sun

The Astronomical Unit (AU) as defined by astronomers is?

the average distance between the Earth and the Sun

For scientists, an element (like gold) is defined by?

the number of protons in its nucleus

All molecules (like molecules of water or carbon dioxide) are made up of

two or more atoms

Which of the following is the Earth NOT located in?

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

When the authors of our textbook say that astronomers are like police detectives?

Both astronomers and detectives must test their hypotheses against any evidence that they gather

By the term universe, astronomers mean?

everything that we can observe