Chapter 1
Light travels 3 x 10^5 meters every second. That number is words is
300,000 meters
The natural object (not one that humans built) in space that's closer to Earth is
The moon
The star that provides energy for life on Earth is
The sun
Of these, which is the largest?
The universe
The smallest piece of an element (like gold or lead) that still has all the properties of that element is called
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?
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
The laws of nature (as determined by scientists)
more than one of the above
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