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Star with halo?

Level 2

This image is caused by what?

A cloud of gas as the star is losing gas None of the above A supernova creating a light spectacular Gravitational lensing resulting in the distortion of a star behind the yellow star

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Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

Used and loved by over 6 million people

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including olympiad champions, researchers, and professionals.

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by Sharky Kesa

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