Physics and Astronomy Online

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Physics & Astronomy Facts

Image of the Keck observatory with a laser shining. Image of the planet Neptune without and with the adaptive optics correction.
Laser Guide Stars

Did you ever wonder why we have to have the Hubble Space Telescope so high up in the Earth's orbit? Why not just make a bigger and better telescope on the surface? ...

Quick Change Artist

The word transformation means one thing changing into another, like Dr. Jekyl changing into Mr. Hyde. In mathematics, sets of numbers often go through transformations. For example, the numbers represe ...

Does The Sun Go A Bit Wobbly?

Our Sun may seem an enduring, unwavering beacon in the sky, but in truth it has a 'heartbeat' of sorts--a pulsation between dimmer and brighter phases so slow that it only 'beats' 9 times each century ...

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