Space exploration began with the launch of Sputnik and Astrophysics was born as the application of physics to the phenomena observed by Astronomy, which etymologically means laws of the stars.
There are 2759 entries in this glossary.| Term | Definition |
|---|---|
| Normal Reflectivity |
For a surface, the fraction of light reflected straight back from a beam of light falling on that surface in a direction perpendicular to it.
|