Kaette Kita Top wo Nerae! Kagaku Kouza
Japanese title: 帰ってきた トップをねらえ! 科学講座
Type: Special
Episodes: 2
Source: Original
Genres: Comedy, Sci-Fi
Studios: Gainax
Duration: 5 min per ep
Rating: G - All Ages

Extra science lessons included with the Gunbuster Blu-ray Box Complete Edition. These explain how the space ropeway works, and time dilation from near-lightspeed travel.