Archives: Glossary Terms: 691 terms

A term used to describe a point directly underneath an object or body.

National Aeronautics and Space Administration.

Near Encounter phase in flyby mission operations.

A cloud of dust and gas in space, usually illuminated by one or more stars. Nebulae represent the raw material ...

Eighth planet from the sun, a gas giant or Jovian planet.

A fundamental particle produced by the nuclear reactions in stars. Neutrinos are very hard to detect because the vast majority ...

A compressed core of an exploded star made up almost entirely of neutrons. Neutron stars have a strong gravitational field ...

A body continues in its state of constant velocity (which may be zero) unless it is acted upon by an ...

For an unbalanced force acting on a body, the acceleration produced is proportional to the force impressed; the constant of ...

In a system where no external forces are present, every action force is always opposed by an equal and opposite ...