If a star’s light is shifted to the red part of the light spectrum, that means
that the light waves we see when we look at that star are longer than
they SHOULD be ... longer than they were when they left the star.
Note:
The wavelengths are NOT "getting longer" while we sit there and look
at them. That doesn't happen. They ARE longer than they should be.
Right now, the only way we KNOW OF that can increase the wavelength
of light is if the source of the light is moving AWAY from us, and so we
mark that star down in our notebook, and next to it we write "This star is
moving away from us.". This is kind of what choice-C is trying to say.
The thing about this whole story that should blow our minds is this:
-- We observe a star or a galaxy.
-- The light we observe has wavelengths longer than they should be.
-- We say that the star or galaxy is moving away from us.
Now, my question to you is:
HOW do we know what the wavelengths SHOULD be ? ?
We only know what we see. How do we know what the
wavelength was when the light left the star or galaxy ?
Answer:
Good:
Quarrying creates jobs in areas where there are limited opportunities.
There is a huge demand for the products of quarrying, such as building stone and cement. ...
Quarrying provides income to local councils through taxation.
Good communications are needed for transporting the products of quarrying.
Bad: Quarrying creates pollution from noise and dust.
Heavy traffic causes pollution and congestion on narrow country roads. ...
Quarries create visual pollution and tourists may be deterred by the scars on the landscape.
Explanation:
Most likely gravity, because the gravity would pull it off course or wobble.
Answer:
Satellites can gather weather data from much higher altitudes than land-based instruments can.
Answer:
A
Explanation:
As the interest rate goes up, your payments and the total repayment amount could increase. On the other hand, if the interest rate happens to drop, you may save money overall and pay less.