The Solar System

And now a few comments
On the nine planets

That orbit around the sun:
Mercury is the smallest one -

Venus is hidden by gas -
Mars has a mysterious past -

Earth is the one we inhabit -
Neptune’s non-descript -

Saturn has rings that spin -
Pluto is no longer in -

Jupiter boasts the largest mass -
And Uranus – has that unfortunate reference to your "a__"