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How far is far?
How fast is fast?
A light year is the
DISTANCE that light
will travel through a
vacuum in one year.
 How many seconds are in a
year?
 31,557,600 s/yr
=
The Speed of Light
 c = 299,792,458 meters per
second
or
186,000 miles per second
To get an idea of how fast
this is. . . light can travel
about seven times around
Earth in one second!
 One light year is approximately 5.880
trillion miles or 9.5 trillion km.
 The symbol for light year is “ly”.
 Light years are used to
measure the vast distances
in space.
In the universe, the kilometer
measure is too small to use.
 Every time you look at
objects in the night sky or
the Sun, the light from
that object is old. You are
looking at histor...
 It takes eight light minutes for light
leaving the Sun to reach the Earth.
 To put this in perspective, if you
could dr...
 Sirius, in the constellation Canis
Major, is the sky’s brightest star. It is
easy to find on winter and spring evenings....
Light Years Notes
Light Years Notes
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Light Years Notes

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Light Years Notes

  1. 1. How far is far? How fast is fast?
  2. 2. A light year is the DISTANCE that light will travel through a vacuum in one year.
  3. 3.  How many seconds are in a year?  31,557,600 s/yr =
  4. 4. The Speed of Light
  5. 5.  c = 299,792,458 meters per second or 186,000 miles per second
  6. 6. To get an idea of how fast this is. . . light can travel about seven times around Earth in one second!
  7. 7.  One light year is approximately 5.880 trillion miles or 9.5 trillion km.  The symbol for light year is “ly”.
  8. 8.  Light years are used to measure the vast distances in space. In the universe, the kilometer measure is too small to use.
  9. 9.  Every time you look at objects in the night sky or the Sun, the light from that object is old. You are looking at history.
  10. 10.  It takes eight light minutes for light leaving the Sun to reach the Earth.  To put this in perspective, if you could drive from the surface of the Sun to the surface of the Earth, it would take you 180 years driving nonstop at 60 mph.
  11. 11.  Sirius, in the constellation Canis Major, is the sky’s brightest star. It is easy to find on winter and spring evenings.  When you look at Sirius, you are looking back in time to see how Sirius looked eight years ago. The light left the star eight years ago.

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