Not sure what exactly you want to "mine". If you have an object at a height below ground level, it has gravitational potential energy, and while lowering it, you can convert that energy to some other type of energy. Note that it requires energy to bring such an object up again, so you need a steady supply of something that is able to fall down - as in a waterfall.
Forget it. Saturn is in a deep pit of gravity.
In the full version of Minecraft, obsidain is usually found in the deep part of caves. Since there are no cave systems in minecraft pe, it's really hard to find it. You just have to keep on mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining and mining until you luckily find obsidian.
Time machine and a mining drill. Comments: I would like to write a more serious answer, but I don't really understand the question. It may be about the Moon's gravity.
mining
The types of mining are shaft mining, strip mining, surface mining, and subsurface mining.
The types of mining are shaft mining, strip mining, surface mining, and subsurface mining.
mining the data is called data mining. Mining the text is called text mining
underground mining is done when the rocks, minerals of gemstones are too far underground to get out with surface mining some kinds of underground mining are Borehole Mining Drift Mining Hard Rock Mining Shaft Mining Slope Mining
As the specific gravity of the methane is 0.55 that is low it tends to accur at roof level that's why it is known as methane layering
I OH NO
The three types of mining -strip mining,open pit mining,and shaft mining
All types of mining from copper mining to gold mining to zinc mining.