How many planets are there in our Solar System?

I need help with ideas for a solar system project for science.

What are some challenges to the integumentary systems (skin system) homeostasis?

How many muscles does it take to smile 17,31,57?

Is their any possibility or has their been any possibility of life in the solar system in the past, or any known places that ...

How many moon they re in univers ?

How many standard time zones are there in the world ?

how many faces does a rectangular prism have? And how many vertices

does anyone think that Pluto is still a planet even though the scientist says its not? I do. I yell at people who say its not...

How many days does it take for saturn to revolve around the sun?

I haven't followed the science debate at all, but I'd like to know. Why is pluto no longer considered a real planet?