Crater by Ensign February 20, 2021 0 A bowl-shaped depression formed by the impact of an asteroid or meteoroid. Also the depression around the opening of a ...
Culmination by Ensign February 20, 2021 0 The moment when a celestial object crosses the meridian and is thus at its highest above the horizon.
Dark Adaptation by Ensign February 20, 2021 0 The eyes' transition to night vision, in order to see faint objects. Dark adaptation is rapid during the first 5 ...
Dark Matter by Ensign February 20, 2021 0 A term used to describe matter in the universe that cannot be seen, but can be detected by its gravitational ...
Dawn by Ensign February 20, 2021 0 Dawn is the transition from night to day as the sky gets brighter. Scientists distinguish between three definitions of dawn ...
DCC by Ensign February 20, 2021 0 The DSN Downlink Channel Controller, one of which is in each DSN Downlink Channel, DC.
