In this picture, we are seeing light from the circled elliptical galaxy (HUDF- JD2)from when the universe was only about 800 million years old. The spiral galaxy below it is much closer. Why does HUDF- JD2 appear a deep red, compared to the whitish color of the nearby spiral?
A)Thick dust from active star formation blocks all the blue light, only letting red light escape.
B)At such a large distance, all the light emitted by it is very redshifted.
C)Even at this young age, the galaxy contains few high mass blue stars.
D)A and B
E)B and C

Question

In this picture, we are seeing light from the circled elliptical galaxy (HUDF- JD2)from when the universe was only about 800 million years old. The spiral galaxy below it is much closer. Why does HUDF- JD2 appear a deep red, compared to the whitish color of the nearby spiral?
A)Thick dust from active star formation blocks all the blue light, only letting red light escape. 
B)At such a large distance, all the light emitted by it is very redshifted. 
C)Even at this young age, the galaxy contains few high mass blue stars. 
D)A and B 
E)B and C

Quizplus · Accepted Answer

At such a large distance, the light emitted by the galaxy is very redshifted, causing it to appear red. Additionally, even at such a young age, the galaxy contains few high mass blue stars which are responsible for producing blue light. Thus, the combination of both factors results in the appearance of a deep red color.

In This Picture, We Are Seeing Light from the Circled