Yes matter does exist. Everything has shape, form, and takes up space in paradise. There is authentic hadith found in Sahih Bukhari and Muslim narrated by Abu Hurayrah that Rasoulillah (saw) said
"The first group (of people) to enter Jannah will be shining like the moon on a full-moon night. Then will come those who follow them who will be like the most shining star in the sky. They will not stand in need of urinating or relieving of nature or of spitting or blowing their noses…. Their wives will be large eyed maidens. All men will be alike in the form of their father `Adam, sixty meters tall.''
So we will be 60 meters tall. The Prophet (saw) explained the distance of trees and how large they are in paradise.
He (saw) said
"In Paradise there is a tree under whose shade a traveller could travel for one hundred years and not reach the edge of it"
I think the Prophet is talking about light years and referring to the distance people could understand. 1 light year is over 5 trillion miles!!!
