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The Space Shuttle was a manned, reusable spacecraft operated by NASA.
The Voyager space probes were the first man-made objects to leave the Solar System. They...
The Earth is divided into 24 time zones. Standard time is the time used within time zones.
Electrochemical processes in a lead-acid battery produce electric current.
Cold and warm fronts are formed where bodies of cold and warm air meet.
Venus is the 2nd planet from the Sun, the brightest object on the night sky (after the Moon).
The diameter of our galaxy is about 100,000 light years; it contains more than 100...
A hot air balloon is a balloon aircraft which is lifted by hot air.
In 1946 a Hungarian scientist was the first person to detect radar echoes from the Moon.
Direct action pumps and suction pumps are among the simplest water pumps.
Simple harmonic motion can be considered to be the one-dimensional projection of uniform...
A force can be measured by measuring the twisting of the torsion wire in a torsion balance.
The Global Positioning System consists of 24 satellites but only 4 have to be visible for...
By varying the position of the light source, you can examine the shades projected onto...
A dynamo converts mechanical energy into direct current.
The largest satellite of Pluto is Charon.
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