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Dictionary

Poynting-Robertson (Effect)

Poynting-Robertson (Effect) Dictionary of astronomy, letter P It is a phenomenon caused by the effect of radiation pressure on small particles of interplanetary dust. As a consequence of the braking suffered by the interaction with the radiation1, the particles move in spiral orbits increasingly closer to the Sun and end up falling on it.
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Universe

Visible stars A-L

Visible stars A-L Alcor: Little bright star belonging to the Big Dipper, which forms, together with Mizar, a double system visible to the naked eye. Aldebaran: Star a of the constellation of Taurus which, with an apparent magnitude of 1.1, is one of the brightest in the sky. Also known as the eye or heart of the Bull, it is 53 light years from Earth and has a luminosity 90 times higher than that of the Sun.
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Earth photos

Antarctic meteorites. Spectacular land

Although meteors fall all over the world, they usually land right at the bottom of the oceans, or are buried by land, or easily confused with land rocks. At the south pole of the planet, exactly, in eastern Antarctica, long areas of blue ice remain pure and unchanged. If they cross along, a dark rock is easily discovered.
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