Recent comments in /f/askscience

Harbinger2001 t1_j6ai2gv wrote

Reply to Shouldn't goldilocks zones shift over time? by LaRoara42

The Sun is heating up. In 1 billion years the Earth will no longer be in the Goldielocks zone. So we probably have about 500 million years before it becomes a real issue for humans. Hopefully by then we should be able to either move the Earth as the zone moves, or build space habitats.

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slashdave t1_j6ahtf1 wrote

Reply to Is there an upper limit to structure size in a vacuum? Could a sufficiently advanced civilisation build a galaxy sized structure in space or would it become too massive and collapse in on itself? by CubanHermes

Galaxies are not dense on average, because of the space between stars. If you want something galaxy sized but denser, there is the serious issue of where you could obtain enough material, since the space between galaxies is quite vast.

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im_not_u_im_cat t1_j6ah2ti wrote

Reply to can gemstones be melted into a gradient? by Acceptable_Shift_247

Jeweler here. I’ve seen from other posts that what you’re asking is impossible, but I thought I’d share a little additional info/advice. I would not recommend a ring made entirely out of gemstones as they are vulnerable to breaks. While both of these gems are quite hard (amethyst is 6 on the Mohs scale, sapphire a 9), it is still risky, and if you’re wearing them every day they are going to have to stand up to a lot.

My recommendation would be to get custom rings with metal bands and regular sapphire and amethyst settings. You could do this in lots of ways (one sapphire and one amethyst on each rings, lots of little gems of each type, one sapphire for the ring of whoever’s stone that is and vice versa). Another idea is that metalsmithers hold classes on making your own jewelry, and I’ve even seen ones where engaged people can come in for a private class and actually make their own wedding rings. Look up metalsmithing classes near you and you may find something.

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spideywat t1_j6acp8z wrote

Reply to Shouldn't goldilocks zones shift over time? by LaRoara42

The only possibility that I have heard is perhaps Mars is where life started, got blasted off by an asteroid impact, fragments came to earth and restarted here as Mars became inhospitable. That was decades ago and we have done lots of studies on Mars since, so the plausibility of that I don’t really know.

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