What is the fifth smallest planet in the 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?

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

Kay well, thats not the question I was going to ask. I was going to ask if -- Is there / or do you think ; there are planets...

how do you convert solar powar from the sun to electicity?

All my life Pluto was a planet. Now it's not? Why? Did it shrink or something? Did the definition change? Did it get kicked...

Whats your favourite planet??

Do you think that Humans will acheive starships that are capable of going at the speed of light before Humans land on Extraso...

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...

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