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What is a coronagraph?

What is a coronagraph? Here are some definitions.

Noun
  1. (astronomy) A telescope that has an attachment which blocks out the direct light from the sun or other star, allowing examination of the corona and the detection of exoplanets
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Examples
The coronagraph, as this special telescope is called, must be located at a high altitude to be effective.
The system then blocks the star with a device called a coronagraph, revealing the exoplanet.
By the time their orbits take them close to the Sun so they become bright, they are lost in the Sun's glare and require a space-based coronagraph like that on SOHO to be seen.
The corona can also be studied under noneclipse conditions with a special telescopic instrument called a coronagraph.
In other words, a coronagraph produces an artificial solar eclipse.
By using a coronagraph, which is a telescope attachment that blocks out the bright light given off by a star, astronomers spotted something orbiting Alcor.

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