Redshift
A shift in the lines of an object's spectrum toward the red end. Redshift indicates that an object is moving ...
A shift in the lines of an object's spectrum toward the red end. Redshift indicates that an object is moving ...
Reflection occurs when light bounces off the surface of an object.
A telescope that gathers light with a mirror. The Newtonian reflector, designed by Isaac Newton, has a small second mirror ...
Refraction is the bending of light as it moves from one substance to another. For example, it happens when sunlight ...
A telescope that gathers light with a lens. The original design showed dramatic rainbows, or 'false color,†around stars and ...
A satellite that orbits close to a planet in a nearly circular, equatorial orbit. Regular satellites are believed to have ...
Receiver Equipment Monitor within the Downlink Channel (DC) of the Downlink Tracking & Telemetry subsystem (DTT).
A state in which an orbiting object is subject to periodic gravitational perturbations by another.
Orbit in which the spacecraft moves in the opposite direction from the planet's rotatation. See prograde.
The phenomenon where a celestial body appears to slow down, stop, them move in the opposite direction. This motion is ...