Bot the NASA/ESA Hubble Space Telescope and the NASA Spitzer Space Telescope have been used to study a collection of 10 planets. Each of these planets is Jupiter-like. They look similar, but come in a wide array of different colors. Gasses are present, and heat - lots and lots of heat. Each orbits very close to its host star, making their study far more difficult than the average non-gas planet. The image you're seeing here is an artist's rendering of the hot 10 - in reality we're only able to see them in very, very tiny dots.