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Biochemical Oxygen Demand (BOD, also called Biological Oxygen Demand) is the amount of dissolved oxygen needed (i.e. demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period. The BOD value is most commonly expressed in milligrams of oxygen consumed per litre of sample during 5 days of incubation at 20 °C and is often used as a surrogate of the degree of organic pollution of water.

A meteoroid  is a small rocky or metallic body in outer space.

Meteoroids are significantly smaller than asteroids, and range in size from small grains to one-meter-wide objects. Objects smaller than this are classified as micrometeoroids or space dust. Most are fragments from comets or asteroids, whereas others are collision impact debris ejected from bodies such as the Moon or Mars.

The Falcon Heavy test flight (also known as Falcon Heavy Demonstration Mission) was the first attempt by SpaceX to launch a Falcon Heavy rocket on February 6, 2018 at 20:45 UTC. The successful test introduced the Falcon Heavy as the most powerful rocket in operation, producing five million pounds-force (22 MN) of thrust and having more than twice the lift capacity of the NASA Space Shuttle launch system.