From the space the sky appears to an astronaut

Options

A. blue
B. red
C. white
D. black

Explanation

### Step-by-Step Solution:

1. **Understanding the Environment of Space**:
- In space, there is no atmosphere. The atmosphere on Earth is composed of gases that scatter light.

2. **Effect of Atmosphere on Light**:
- On Earth, the scattering of light by the particles in the atmosphere allows us to see colors in the sky. This scattering is responsible for the blue color of the sky during the day.

3. **Absence of Scattering in Space**:
- Since there is no atmosphere in space, there are no particles to scatter light. Therefore, light does not scatter in the same way as it does on Earth.

4. **Visual Perception in Space**:
- Without scattering, when astronauts look out into space, they do not see the colors of the sky. Instead, they see a black sky because there is no light being scattered to their eyes.

5. **Conclusion**:
- Thus, from space, the sky appears black to astronauts.

### Final Answer:
From space, the sky appears black to an astronaut.