The advancements in steel
From all of them can be made
Arrows have traditionally been made of solid shafts of wood such as ash, elm, willow, oak, cedar, or Sitka spruce. Hollow arrow shafts may be formed of modern materials like aluminum, fiberglass, graphite, or carbon fiber.
The Sun's approximate luminosity during the subgiant stage is 10Lsun.
hope this helps
