Imagine the Universe!
Imagine Home  |   Ask an Astrophysicist  |  
Ask an Astrophysicist

The Question

(Submitted January 29, 1997)

Hello, I am 4 years old and I would like to know why space is black. Thank you for taking the time to answer me. (My auntie is typing this for me)

The Answer

This is a very good question!

Do you know why the sky is bright and blue during the day? It's because the Sun is shining on the air, so the air becomes bright.

The Sun is shining in space too, but there is no air for the light to bounce off of in space. That's why space is black.

Best wishes,
Koji Mukai
for Imagine the Universe!

Questions on this topic are no longer responded to by the "Ask an Astrophysicist" service. See for help on other astronomy Q&A services.

Previous question
Main topic
Next question

Imagine the Universe is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA's Goddard Space Flight Center.

The Imagine Team
Acting Project Leader: Dr. Barbara Mattson
All material on this site has been created and updated between 1997-2012.

DVD Table of Contents
Educator's Index