Why Does Earth Appear Mostly Blue from Space?

  • Thread starter Thread starter rootone
  • Start date Start date
  • Tags Tags
    Dot
Click For Summary
Earth appears mostly blue from space primarily due to the reflection of sunlight by its oceans, which absorb more red light and reflect blue light. The processes occurring on Earth, such as the absorption of higher energy light and its subsequent radiation in infrared, contribute to this phenomenon. The light observed from space is not blackbody radiation but rather reflected light, predominantly from the Earth's surface. The significant amount of incoming sunlight that is reflected away without interaction further emphasizes the blue appearance. This characteristic is largely attributed to the properties of water, which reflects blue wavelengths effectively.
rootone
Messages
3,394
Reaction score
946
Why does the Earth appear blue (mostly) when observed from outside.
Blue light is more energetic than red and lower wavelength.
Processes which happen on Earth seem to suggest that higher energy light arriving should be absorbed in one way or another and eventually some of it radiated away in infrared and lower wavelength.
Why does the Earth not look red when seen from outside?
 
Astronomy news on Phys.org
What does Earth's surface consist of? The reflected light is not blackbody radiation, it is reflected light.
 
As Orodruin said, it is light that is reflected from the Earth that is seen in visible light cameras, not the light emitted by the Earth.
 
OK, so on the sunlight side of Earth a high proportion of all the incoming light is just reflected away and doesn't otherwise interact.
I guess the reason why the reflected light is more in the blue end of the visible spectrum is simply because that is a just property of water - it reflects bluer light and absorbs more red.
 
  • Like
Likes davenn

Similar threads

  • · Replies 27 ·
Replies
27
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 8 ·
Replies
8
Views
3K
Replies
8
Views
4K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 5 ·
Replies
5
Views
1K
  • · Replies 25 ·
Replies
25
Views
2K