Light is composed of protons, which have no mass, therefore light has no mass and cant weigh any thing.
Mermaids cannot weigh anything, but most say as light as a tiny pebble but they are as stong as the stongest crain in the world
No.
Altitude doesn't weigh anything.
Well they can weigh anything but the average is about 7 pounds
the galexy does not weigh anything its mass is around 1,153,678000000000000000000000000000000000000 kg
an ocean
your shadow
Your Shadow
This will depend on what type of goose. You cannot weigh anything online.
Air
Anything you want