At first I thought you mean shooting the body into outer
space.
But then I remembered the Tibetan practice.
I'm not sure if this is legal in Singapore, though that's one of
the choices one can consider, though not very popular in our
particular culture.
The Parsees of India also practice sky burial, they have built
a tower of tower of silence within the city, where the
vultures come to feed.
However with declining vulture population, there is a problem.
So now they have now added solar panels to hasten the
decomposition!