Tungsten is starting to show up as a crafting ingredient for pretty much everything that I need to build next. I have yet to come across anything that I could smelt to create it. Where do you find this resource?
Tungsten is only found on specific planets. If you are still on the starting world, you will not yet have the ability to obtain it. You will need to build a small ship and travel to the moon. Dig below the surface and you will end up finding a lot of this in the caves. It is very common. You just need to get to the moon first which requires you to build a few things.