sun

A year of Sun

This montage of 366 images shows our Sun through the eyes of ESA’s Proba-2 satellite, as seen each day in 2016. The satellite’s SWAP camera works at extreme ultraviolet wavelengths to capture the hot turbulent…


Better (solar) weather predictions

Excitement is building over European plans to launch a new space-weather satellite that would drastically improve forecasts of how solar storms will affect Earth. The European Space Agency (ESA) hopes to send the probe to…


Amazing Analemmas

The analemma, the 8-figure the Sun seems to make in the year in the sky, is caused by two effects: the tilting of the Earth axis (making the seasons) and the elliptical orbit of the…


Supersonic Sun

Ubiquitous supersonic (150 km/s – 350 km/s) events in the solar chromosphere have been discovered fortuitously by CLASP (Chromospheric Lyman Alpha SpectroPolarimeter) which was carried up above the atmosphere by a sounding rocket on September…


A new hunt for neutrinos?

In 2009, applied physicist Peter Sturrock was visiting the National Solar Observatory in Tucson, Arizona, when the deputy director of the observatory told him he should read a controversial article about radioactive decay. Although the…


Building the outer layers of the Sun

Although the solar energy sources are located at the core of the Sun, the temperature of the upper part of the solar atmosphere (called the chromosphere and corona) is higher than that of the visible…