Answer 1:
If you were writing a story about hero’s day
living on the planet Jupiter, it would be a
much shorter story than her day on earth!
Your question asked specifically about hours on
Jupiter, but since we measure seconds, minutes,
and hours with atoms (heard of an atomic
clock?) I think you were asking about how your
experience with time would be different on a
different planet. I hope I’m right! If not, please
write back :)
On Earth, we use the planet’s rotation to count
time passing. This is because humans could
understand day and night before we could
understand how atoms can tell time! Since the
Earth isn’t like other planets (different shape,
different distance to our Sun, etc.), the days
on Earth are also different than other
planets. Here (on Earth), one day is 24
hours long. This gives your hero 8 hours to
sleep and 16 hours for her to climb mountains or
swim in the ocean or trek through the forest.
Since one Earth day is also one rotation of the
Earth around its axis, it makes sense to say that
one day on Jupiter is also one rotation around
its own axis.
It so happens, that Jupiter is a huge planet!
Not only that, but it spins very, very
fast. While Earth is spinning at about
1,000 miles per hour (quite quickly!), Jupiter is
spinning at a crazy 28,000 miles per hour!!
This means that one rotation of Jupiter
takes only 9 hours and 56 minutes. Your hero
needs her rest, so she will still sleep for 8
hours. Unfortunately, that leaves fewer than 2
hours for adventures. Such a shame. I think she
will be more successful if she stays on Earth,
where the days are longer.
Thank you for writing! Good luck with your
project! | 
