I was surprised none of the nerds among us posted on this news. This research has a ways to go but heating to 1000 C from sun would melt AL, CU, brass and bronze. A foundry powered by the sun - wow. https://arstechnica.com/science/2019/11/company-claims-breakthrough-in-concentrating-the-suns-rays/ Confession. When I was a kid there was a time I was seriously into burning stuff with a magnifying glass.