This is a really clever idea that's
theoretically possible as the sun would indeed
destroy anything sent toward it. Once in space, a
ship would initially orbit the sun along with the
earth, but it would be relatively straightforward
to slow the garabage's orbit and launch it into
Though I should note that compressed air, while
convenient for household applications, wouldn't be
a very effective propellant for this kind of
thing-- thankfully, modern rocket fuels are
significantly more powerful.
Probably the largest obstacle to something like
this ever happening (at least in the imaginable
future) is that it's extremely expensive to
send things to space, requiring enormous
amounts of energy to escape Earth's gravity.
Currently it costs about $10,000 per pound just to
get into orbit! While landfills are terrible and
environmentally damaging, making the energy to
send their contents into space would be even more
Another concern is space debris, which
are already a serious problem from the small
number of satellites and other ships that have
blown up in space. If a garbage spaceship exploded
in Earth's orbit, its cargo could get stuck
floating there, which would be dangerous for
future spacecraft and satellites.
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