And the answer is...

Shuttle

When a comet approaches the Sun, its head leads the way, but as it travels away from the Sun, the tail is in front. This is due to the effects of the solar winds.

Shuttle

The StarChild site is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), 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: J.D. Myers
Responsible NASA Official: Amber Straughn