Solar System

Why is Pluto no longer a planet?

What is it about Pluto that made astronomers – such as the likes of Dr Mike Brown, Professor of Planetary Astronomy at the California Institute of Technology (Caltech) – insist on its declassification?
Four images from NASA's Solar Dynamics Observatory of an X3.2-class flare from late at night on May 13, 2013. The flare has been captured in different wavelengths to help astronomers learn more about these outbursts. Solar System

Five Amazing Facts: Solar Flares

The Sun has reached its solar maximum where its surface should be peppered with sunspots and erupting with solar flares and coronal mass ejections but, according to spacecraft, our star hasn’t been this inactive since 100 years ago. It has released the odd solar flare, however, and you can learn more about them here.

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