Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. While Danish ...

Tycho Brahe was an alchemist who was reluctant to share his discoveries. In his laboratory, however, he worked with an element that humanity discovered nearly 200 years after his death.

And yet, there was a time when there were no telescopes when astronomical observations were still being done… Danish astronomer Tycho Brahe is best known for measuring and fixing the positions ...