Browse Reference Articles
171 to 180 of 180 articles
-
Solar eclipse
A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partially obscuring Earth's view of the Sun. This configuration can only occur during a New Moon, when the ... > more -
Hybrid rocket
A hybrid rocket propulsion system comprises propellants of two different states of matter, the most common configuration being a rocket engine composed of a solid propellant lining a combustion ... > more -
Multiverse
A multiverse (or meta-universe) is the hypothetical set of multiple possible universes, including our universe, which comprise the absolute whole of physical ... > more -
Neil Armstrong
Neil Alden Armstrong (born August 5, 1930) is a former American astronaut, test pilot, naval aviator. He is famous as the first human ever to step foot on the ... > more -
Space Shuttle program
NASA's Space Shuttle, officially called Space Transportation System (STS), is the United States government's only manned launch vehicle currently in service. It is the first winged manned spacecraft ... > more
Search ScienceDaily
Number of stories in archives: 137,221

