Flexi Says: Early observations suggest that many exoplanets have habitable environments similar to those found in our solar system. Our Milky Way galaxy alone contains about a hundred billion planets. Scientists have only begun to study a tiny fraction of these. Several planets, like Kepler-22b, have recently been discovered that are in the habitable zones of a Sun-like star. This means that the planet could have liquid water, which is necessary for life on Earth. This planet is larger than Earth, but may have pleasant surface temperatures. Still, the chances that it harbors life are slim, but there are likely many more Earth-like planets in the universe. Scientists are also interested in searching for extraterrestrial life in our own solar system on Jupiter's moon Europa and Saturn's moon Enceladus as these moons likely have oceans of liquid water underneath beneath their icy surfaces. Saturn's moon Titan is also of interest because its atmosphere is similar to what Earth’s was like when the earliest cells developed.