Don’t know for sure but I guess it is due to energy cost of getting the rocket deeper than previous ones, and also the purpose. There needs to be a tangible reason for the cost of sending a rocket, why send one when a telescope can provide some information?
Again, the Physicist here will provide a better, scientific answer than mine 🙂
The only reason we haven’t done this *yet* is because the Milky Way is simply *so* huge – about 100,000 light years across! To travel out of the Milky Way would either require us to travel many times the speed of light, or to wait long enough for a spacecraft to travel these sorts of distances, which would take a very long time!
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