And the answer is...
The tilt of the Earth on its axis is why we have a change of seasons.
The StarChild site 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/ GSFC.
StarChild Authors: The StarChild Team
StarChild Graphics & Music: Acknowledgments
StarChild Project Leader: Dr. Laura A.
Whitlock
Curator:
Responsible NASA Official:
If you have comments or questions about the StarChild site, please
send them to us.