104 Chapter 2 From the Solar System to the Milky Way
Let me explain
the galaxy to
you a lile
beer.
Um, is she
okay?
She's fine.
This always
haens.
The diameter of the disc part
is 100,000 light-years.
100,000 light-
years? What in
the world are
you talking
about?!
It's the distance
that light travels
in 100,000 years!
That doesn’t
help at a.
Isti have no
idea what that
means.
Te me in miles,
ft, even
centimeters!!
I refuse to
respond to
this fld of
questions.
1 light-year is
9.4607309725808
× 10
15
meters =
9.46triion km =
5.88 triion miles=
aroxi mately
63,240 astronomical
units(AU)!
So 1 light-year
is roughly
6triion miles.
Even in
m

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