Even though the object is weightless, it would need inertia, I.e, you pushing it or any form of transportation. So you would still have to push that 500kg to just keep it moving in space. Say if it were a planet with less gravitational force, it would be weightless.
The physical description would be soft due to the lava cooling the rock.
<span>When electrons are added to two negatively charged objects,
the repelling force between them increases. </span>
Because gases flow easily. A hot batch of gas can rise through
the surrounding gas a lot easier than, say, a hot batch of mud can
rise through the surrounding mud.