contestada

What will be evidence of a galaxy moving toward earth?
a. The galaxy has a loose, disorganized appearance
b. the stars in the galaxy appear to twinkle .
c. THE GALAXY APPERS TO BE ACCELERATIN.
d. THE LIGHT WAVELENGHTHS COMING FROM THE GALAXY ARE BECOMING SHORTER

Respuesta :

SugoiPlatypus
D.
Since we see light different based on their wavelength.
Blue for short, Red for long.
AL2006
None of the choices is correct. Choice 'd' has a grain of truth, but just a grain, and it's still sadly unclear on the concept.

If a star or galaxy is moving toward Earth, then the wavelengths of the radiation coming from it are shorter than they SHOULD BE, but they're not becoming shorter.

The real trick to measuring what's really going on is in knowing what the wavelengths SHOULD be.