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Space Shuttle

The Space Shuttle was a manned, reusable spacecraft operated by NASA.

Voyager space probes

The Voyager space probes were the first man-made objects to leave the Solar System. They...

Time zones

The Earth is divided into 24 time zones. Standard time is the time used within time zones.

Lead-acid battery

Electrochemical processes in a lead-acid battery produce electric current.

Warm front, cold front

Cold and warm fronts are formed where bodies of cold and warm air meet.

Venus

Venus is the 2nd planet from the Sun, the brightest object on the night sky (after the Moon).

Milky Way

The diameter of our galaxy is about 100,000 light years; it contains more than 100...

Hot air balloon

A hot air balloon is a balloon aircraft which is lifted by hot air.

Moon radar experiment (Zoltán Bay, 1946)

In 1946 a Hungarian scientist was the first person to detect radar echoes from the Moon.

Suction pumps and direct action pumps

Direct action pumps and suction pumps are among the simplest water pumps.

Simple harmonic motion and uniform circular motion

Simple harmonic motion can be considered to be the one-dimensional projection of uniform...

Torsion balances

A force can be measured by measuring the twisting of the torsion wire in a torsion balance.

Satellite navigation, GPS

The Global Positioning System consists of 24 satellites but only 4 have to be visible for...

Light and shadow

By varying the position of the light source, you can examine the shades projected onto...

Dynamo (basic)

A dynamo converts mechanical energy into direct current.

Pluto - Charon system

The largest satellite of Pluto is Charon.

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