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A full frame camera has less depth of field than APS-C for a given aperture allowing for more creative effects especially for portraits and nature shots. Full frame is a bigger body and if hiking you would likely want something smaller and lighter perhaps to complement a full frame.
You can pick up a full frame Canon 5D Mkii or 6D at around $600 to $800 and this at Teds Camera Store when they have one in their secondhand section, perhaps less privately but it depends on shutter count too. Same also for a full frame EF-L 24-105 f4 IS lens as they used to be kitted with these.
For astrophotography a full frame gives you more field of view but you will have to have suitable optics to correct any aberrations. I would not want to hike with a 5D but it is doable.
Mirrorless full frame are certainly smaller and lighter than DSLR although I’m not familiar with any.
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