In fact, according to computer
simulations a whole second Solar System’s worth of planets may be
lurking at thousands of times the distance of Earth from the Sun.
a whole second solar system's worth of planets怎么理解,谢谢各位高人帮忙。
应该不是这个意思,下句是:These could turn out to be as big as Mars or even Earth – not
formed in situ, but thrown there by the gravity of the gas giant
planets.
体积与火星或地球差不多。