Bibliography (14):

1. The Halo Drive

2. Pondering the ‘Dyson Slingshot’

3. Investigating the ‘Halo Drive’

4. A ‘Halo Drive’ Could Accelerate Interstellar Spacecraft to close to the Speed of Light

5. Using Black Holes to Conquer Space: The Halo Drive!

6. Gravitational Machines

7. The Schwarzschild black hole as a gravitational mirror

8. Wikipedia Bibliography:

   1. Gravity assist

   2. https://en.wikipedia.org/wiki/Neutron_star  :

      https://en.wikipedia.org/wiki/Neutron_star

   3. Photon sphere

   4. https://en.wikipedia.org/wiki/Black_hole  :

      https://en.wikipedia.org/wiki/Black_hole

   5. Binary black hole  :

      https://en.wikipedia.org/wiki/Binary_black_hole

   6. https://en.wikipedia.org/wiki/Redshift#Blueshift  :

      https://en.wikipedia.org/wiki/Redshift#Blueshift

   7. Terminal velocity