a view across a hypothetical primitive alien planet towards a brown dwarf in the sky. - 天體生物學 幅插畫檔、美工圖案、卡通及圖標
artist's concept of a river on early mars. millions of years ago, water flowed down the canyons of mars. - 天體生物學 幅插畫檔、美工圖案、卡通及圖標
future astronauts may enjoy watching the double sunrises and double sunsets of mercury. - 天體生物學 幅插畫檔、美工圖案、卡通及圖標
the sun seen from the surface of mercury looms three times larger in the sky than it does from the earth. - 天體生物學 幅插畫檔、美工圖案、卡通及圖標
artist's concept of a planet pushed out of its orbit striking another planet. there will be no survivors. - 天體生物學 幅插畫檔、美工圖案、卡通及圖標
a gigantic scarp on the surface of uranus' moon, miranda. it is the sheerest known cliff in the solar system. it may be 3 miles high. - 天體生物學 幅插畫檔、美工圖案、卡通及圖標
artist's concept of how an extraterrestrial civilization on an earth-like planet might look. - 天體生物學 幅插畫檔、美工圖案、卡通及圖標
a panoramic view of the surface of a rocky and barren alien world. a large cloud covered planet rises over the airless environment. - 天體生物學 幅插畫檔、美工圖案、卡通及圖標
an earth-like planet made up of silicate-based rocks with oceans coating its surface. - 天體生物學 幅插畫檔、美工圖案、卡通及圖標
a scene on the tortured, wrinkled terrain of miranda, one of uranus' many moons. - 天體生物學 幅插畫檔、美工圖案、卡通及圖標
uranus seen from the surface of its moon, ariel. uranus' moon ariel boasts an enormous trench-like chasm where two blocks of its icy crust have separated. - 天體生物學 幅插畫檔、美工圖案、卡通及圖標
billions of years from now, the sun will expand into a red giant star, baking our planet in the process. - 天體生物學 幅插畫檔、美工圖案、卡通及圖標
the ice spires of jupiter's moon callisto were created when softer ice evaporated, leaving behind the harder cores. - 天體生物學 幅插畫檔、美工圖案、卡通及圖標
future astronauts observing an eruption on io, jupiter's super-volcanic moon. - 天體生物學 幅插畫檔、美工圖案、卡通及圖標
a view across a hypothetical primitive alien planet towards a brown dwarf in the sky. - 天體生物學 幅插畫檔、美工圖案、卡通及圖標宇宙探索
