If you write a 1
followed by 3 zeros,
you get 1,000 = one thousand.

If you write a 1
followed by 6 zeros,
you get 1,000,000 = one million.

If you write a 1
followed by 9 zeros,
you get one billion!

It's your turn.
Try writing out one billion in the box below:

Takes time, right? And astronomers
often deal with even larger numbers such as a trillion (12 zeros) and
a quadrillion (15 zeros). So, when astronomers write numbers with lots
of zeros, they use a shorthand called scientific
notation. Instead of writing out a 1 followed by 9 zeros,
they write a billion like this: 10^{9}.

It's your turn to use scientific
notation.

How would you write a trillion:
10^{13}
10^{16}
10^{12}