Although the light year is a
commonly used unit, astronomers
prefer a different unit called the parsec (pc). A parsec, equal to 3.26
light years, is defined as the distance at which 1 Astronomical Unit subtends an
angle of 1 second of arc (1/3600 of a degree) When we use the parsec for really
large distances, we often put a prefix in front of it - like kiloparsecs (kpc),
which are equal to 1000 parsecs - or Megaparsecs (Mpc), equal to a million
parsecs.
The Milky Way is about 1,000,000,000,000,000,000 km
(about 100,000 light years or about 30 kpc) across. The Sun does not lie near
the center of our Galaxy. It lies about 8 kpc from the center on what is known
as the Sagittarius arm of the Milky Way.
They are not being produced as fast as they are being used.
Answer:
Explanation:
Given
Parallel to: 
Passes through (-9,-4)
Required
Determine the line equation
First, we calculate the slope (m) of the said line
Make y the subject
Divide through by 3
An equation has the general form:
Where
So:
Because the required line is parallel to , then they have the same slope of
Next, is to calculate the line equation using:
Where
This gives:
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