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Magnitude of an Astronomical Object

'Visual magnitude' is a scale used by astronomers to measure the brightness of a star. The term 'visual' means the brightness is being measured in the visible part of the spectrum, the part you can se ...

What is Dark Energy?

Because he originally thought the Universe was static, Einstein conjectured that even the emptiest possible space, devoid of matter and radiation, might still have a dark energy, which he called a 'Co ...
Global mosaic of 102 Viking 1 Orbiter images of Mars taken on orbit 1,334, 22 February 1980. The images are projected into point perspective, representing what a viewer would see from a spacecraft at an altitude of 2,500 km.
Exploring The 'Red Planet'

The planet Mars, sometimes called the 'Red Planet', has been an object of study for many centuries. The distinctive reddish color of the planet led some cultures to associate Mars with bloodshed and w ...

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