Death Star
The Death Star is a type of fictional mobile space station and galactic superweapon featured in the "Star Wars" space opera franchise. The first Death Star is stated to be more than 100 km to 160 km in diameter, depending on source. It is crewed by an estimated 1.7 million military personnel and 400,000 droids. The second Death Star is significantly larger, between 160 km to 900 km in diameter depending on source, and technologically more powerful than its predecessor. Both versions of these moon-sized fortresses are designed for massive power-projection capabilities, capable of destroying multiple naval fleets or entire planets with one blast from their superlasers.
Hypervelocity Asteroid Intercept Vehicle
In 2013, a meteor about 30 meters in diameter and weighing about 13,000 metric tons had an impact event over Russia. Once in Earth's lower atmosphere it burned up and then exploded. NASA expected the meteor to burn up without any issues, but was not the case. This relatively small meteor damaged over 7200 buildings and injured over 1400 people. The Chelyabinsk meteor brought renewed attention towards asteroid defense and the remains of the meteor gave scientists more data on asteroids.