Fig 1. Schematic view of the setup.
Left the movable chair on a rail and at the right the 3D screen with a cloud of stars.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.