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" ... But in the far, outer reaches of the Solar System, that pre-solar dust could have survived. We've flown into the trails of comets before, collecting interplanetary dust particles and analyzing their composition. They are known to contain grains of amorphous silicates on tiny, sub-micron scales, many of which appear to be carbon-free. ... "
" ... Concepts of crewed Mars missions take about six months for between three and six astronauts to reach the planet, along with a few dozens of tons of consumables. Although it may be possible for some resources to be obtained from Mars—carbon dioxide from the atmosphere, water ice from the soil to produce oxygen and organic compounds, hematite to produce iron, silicates to produce glass—we’re decades away from understanding if any of that would be practically possible. ... "
" ... We think you have to be outside of the frost line to first form a gas/ice giant, but that migration is quite normal. These hot Jupiters (or hot Neptunes) are not at all uncommon, and are some of the easiest planets to find with our current techniques. From the combination of metal-rich material (which forms planetary cores), mantle-like silicates (which can form all throughout a proto-solar system), and ices, gases, and other volatiles (which are more abundant beyond the frost line), we see a general picture begin to emerge. ... "