Some 40 light-years from Earth, a planet called TRAPPIST-1e offers a heart-stopping view: brilliant objects in a red sky, looming like larger and smaller versions of our own moon. But these are no moons. They are other Earth-sized planets in a spectacular planetary system outside our own.
The fiery depths of space: Astronomers capture dazzling rainbow nebula swirling round supergiant star
Exoplanet discovery: seven Earth-sized planets found orbiting nearby star
The top row shows an artist’s conception of the seven planets of Trappist-1 with their orbital periods, distances from their star, radii and masses as compared to those of Earth. The bottom row shows data about Mercury, Venus, Earth and Mars.