Illustration showing the evolution of the interior of the planet Mars. At the start of the sequence (left) Mars has a silicate magma ocean (orange) and metallic core (yellow). The second panel shows the core has evolved into a solid inner core and a ...

Illustration showing the evolution of the interior of the planet Mars. At the start of the sequence (left) Mars has a silicate magma ocean (orange) and metallic core (yellow). The second panel shows the core has evolved into a solid inner core and a ...

Illustration showing the evolution of the interior of the planet Mars. At the start of the sequence (left) Mars has a silicate magma ocean (orange) and metallic core (yellow). The second panel shows the core has evolved into a solid inner core and a ...

... 15 km. The field, which closely resembles that of a bar magnet, is generated by the dynamo effect. Inside the Earth's outer core, convective heating causes cells of ionised metal to rise and fall in a circular motion. These act like gigantic electri ...

Artwork depicting a cluster of galaxies. Many of them are active - with superluminal jets emerging from their cores, likely powered by black holes....

Illustration depicting asteroseismology - the study of oscillations inside stars. Because a star's different oscillation modes are sensitive to different parts of the star, they inform astronomers about the internal structure of the star, which is ot...

... begin to merge. The Solar System's fate is uncertain. It might end up in the final, larger galaxy, orbiting further from the core than it does now, or it might be ejected into space altogether. ...

... d from the collision of stars or stellar remnants in the jam-packed environment surrounding a supermassive black hole at the core of an ancient galaxy.' This image depicts the event taking place on the outskirts of the black hole's accretion disc. ...