Mars is the planet that has a year 687 earth days long.
Mars has a year of about 687 Earth days.
mercury is the planet which revollve around sun in 687 days it means there is a yeqr is equal to 687 days
Mars has an orbital period of around 687 days.
The Mars year is 687 Earth days long.
the answer is... Mars!
depends which planet your talking it about Mercury about 88days Mars 687 days
One martian year is roughly 687 earth days long.
The planet Mars