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The World Wide Web

Diagram showing that the internet is composed of many things besides the World Wide Web, such as email, telnet, P2P, and Chat.

Original picture with caption
Image credit: Helen Klus
Licence: Public domain
Link to high-res image

Trigonometry

Diagram of a right-angled triangle. The largest side is labelled ‘c’. The shortest ‘b’, and the other side is labelled ‘a’. The angle opposite side ‘a’ is labelled ‘A’, the angle opposite side ‘b’ is labelled ‘B’, and the angle opposite side ‘c’ is labelled ‘C’. From the perspective of angle ‘A’, length ’a’ is the opposite length, length ‘c’ is the hypotenuse, and length ‘b’ is the adjacent length.

Original picture with caption
Image credit: Helen Klus
Licence: Public domain
Link to high-res image

Sine wave

Plot of a sine wave from 0 to 360 degrees.

Original picture with caption
Image credit: Helen Klus
Licence: Public domain
Link to high-res image

Sine wave

Plot of a sine wave from -360 to 360 degrees.

Original picture with caption
Image credit: Helen Klus
Licence: Public domain
Link to high-res image

Spectral lines

Diagram showing that a continuous spectrum is created if light comes directly from a star. Absorption lines are created if the light travels from the star and through a cloud. This is because matter in the cloud absorbs some of the light. An emission spectrum is created from light directly emanating from the cloud, where light is only produced at specific wavelengths.

Original picture with caption
Image credit: modified by Helen Klus, original image by Magnus Manske/Jhausauer
Licence: Public domain
Link to high-res image

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