Many people are still upset that Pluto was demoted from being a planet. But definitions of various celestial objects are fairly fluid. So whether it is an asteroid or moon or planet is up for debate.
Articles on Sun
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The Parker Solar Probe makes it closest-ever approach to the sun.
Solar cells make electricity directly from sunlight, but how do they do it?
Beyond the outer edge of the Solar System, mysterious, unknown worlds await by the thousands. Astronomers can now finally find them and explore them - but will we find another Earth?
Kepler-452b is sometimes called ‘Earth 2.0’, but there’s a lot we still don’t know about it.
In Asian countries, many people wield umbrellas to protect them from the sun. American women used to as well – but then stopped.
Yes, the Sun absolutely spins. In fact, everything in the universe spins. Some things spin faster than the Sun, some are slower and some things spin ‘backwards’.
The very hottest stars actually glow blue.
The sun’s phenomena, like flares, can cause solar particles to enter the Earth’s atmosphere, with material effects.
Electricity happens when electrons move from one atom to another.
While the world gathers to see an eclipse, what’s the rest of nature doing?
Scientists spend years preparing for the two-minute window of a total solar eclipse.
It’s true that here on Earth, if you want to burn something you need oxygen. But the Sun is different. It is not burning with the same kind of flame you would have on Earth if you burned a candle.
An expert explains all the wonderful ways the atmosphere protects life on Earth.
Even if we can prevent a global warming apocalypse, our planet won’t be safe forever – the sun will one day expand. So should we try to move the Earth to a wider orbit?
Exoplanet discovery can help us work out how the Earth will end its days.
The Lagrange mission could greatly improve forecasts of space weather.
There are three ways heat can be shared: conduction, convection and radiation. Find out which one lets heat travel through space.
Simply closing your eyes will protect your eyes from sunlight. But looking straight at it can cause serious damage.
The reason we have seasons is because, during its journey around the Sun, the Earth is tilted.
Top contributors
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Senior Curator (Astronomy), Museums Victoria Research Institute; The University of Melbourne
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Senior Lecturer in Physics, Nottingham Trent University
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Associate Professor, RMIT University
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Director of the Abrams Planetarium, Michigan State University
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Teaching Professor of Astronomy & Astrophysics, Penn State
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Reader in Physical Sciences, Aberystwyth University
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Postdoctoral research associate, University of Oxford
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Professor of Astronomy, Mathematics, and Physics, Athabasca University
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Researcher in Astrophysics, Smithsonian Institution
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Professor (Astrophysics), University of Southern Queensland
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Professor of Physics and Astronomy, USC Dornsife College of Letters, Arts and Sciences
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Professor (Physics), University of Southern Queensland
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University Distinguished Professor of Astronomy, University of Arizona
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Professor of Physics, UCL
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Chief Specialist Scientist (Public Health), South African Medical Research Council