system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can't we send a satellite to orbit other planets?

Just like we have satellites orbiting the earth why can't we send probes in orbit around other planets? Like the New Horizons just went past Pluto. It would be so much better if it could orbit Pluto and hence collect data over a longer period?
gpt
We can.  We have a satellite orbiting Saturn, and *five* orbiting Mars.

But getting into orbit around other planets is tricky.  You have to get enough speed to reach the other planet, and then get *rid* of a lot of that speed to stay there in orbit.  This isn't too bad if the planet is relatively close (Mars) or has a very high mass (Saturn), but for something as small and as far away as Pluto, it would take more fuel than we can practically add to a probe to get it to slow back down and enter orbit.