The majority of exoplanets discovered so far are bloated, fast-spinning gas giants, known as "hot Jupiters," that orbit extremely close to their stars and are thus probably unsuitable for life.

迄今发现的系外行星大部分是膨胀的、高速旋转的由气体构成的庞然大物，人们称之为“热木星”。“热木星”的轨道距它们的恒星非常近，因此可能不适合生命。