This family portrait, a composite of the Jovian system, includes the edge of Jupiter (with the Great Red Spot visible) and Jupiter's four largest moons, known as the Galilean satellites. From top to bottom are Io, Europa, Ganymede, and Callisto. The smallest of these four moons, Europa is about the size of Earth's moon.
Mass one-thousandth that of the Sun but is two and a half times the mass of all the other planets in our Solar System combined. #Jupiter is classified as a gas giant along with Saturn, Uranus and Neptune. Together, these four planets are sometimes referred to as the Jovian or outer planets.
Betelgeuse ~ The bright, pinkish-white star at upper left of Orion. A red supergiant, it is one of the largest and most luminous stars known. Betelgeuse is approximately 640 light-years away from Earth. If it were at the center of our solar system, its surface would extend to the orbit of Jupiter and beyond, wholly engulfing Mercury, Venus, Earth and Mars. Betelgeuse is a star nearing the end of its life. (NASA)