Sun’s adolescent storms may have been key to life on Earth

Some 4 billion years ago, the Sun shone with only about three-quarters the brightness we see today, but its surface roiled with giant eruptions spewing enormous amounts of radiation into space. These powerful solar explosions may have provided the crucial energy needed to create greenhouse gas in Earth’s atmosphere, warming the planet and incubating life.

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Hubble’s vibrant view of a massive galactic gathering

This incredible image from the NASA/ESA Hubble Space Telescope reveals thousands of colourful galaxies in the constellation of Leo, components of cluster known as MACS J1149.5+2223. This vibrant view of the early universe was captured as part of the Frontier Fields campaign, which aims to investigate galaxy clusters in more detail than ever before.


Radioactive fuel boosts supernovae explosions

Some supernovae have a reserve tank of radioactive cobalt-57 fuel that cuts in and powers their explosions for three times longer than astronomers had previously thought. The discovery by Australian and US researchers gives important new clues about the causes of Type Ia supernovae, which astronomers use to measure vast distances across the universe.