GK
BIG BANG THEORY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
very cold
|
|
|
moving towards us
|
|
|
dying
|
|
|
about to supernova
|
Detailed explanation-1: -When an object is moving away from us, the light from the object is known as redshift, and when an object is moving towards us, the light from the object is known as blueshift.
Detailed explanation-2: -One example of this is the monstrous Andromeda galaxy, which is headed toward us at high speed. We actually will collide with it, though not for quite some time (like, 4 billion years). But it shows a distinct blueshift in its light; it’s moving around faster than space is expanding. M98 is doing the same thing.
Detailed explanation-3: -Astronomers can measure this wobble by using spectroscopy. If a star is traveling towards us, its light will appear blueshifted, and if it is traveling away the light will be redshifted. This shift in color will not change the apparent color of the star enough to be seen with the naked eye.