On this day in 1181, observers in China and Japan looked up at the night sky and saw an unusually bright star in the area we describe as the W-shaped constellation Cassiopeia. They didn't realize it ...

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

AGEN1181 is an enhanced CTLA-4 inhibitor, a cancer therapy. Updated preliminary Phase 1 trial results were presented at AACR. Several types of cancer showed complete or partial responses. Photo by ...

In context: Let's rewind the cosmic clock more than 800 years to 1181 AD. Chinese and Japanese stargazers witnessed a brilliant "guest star" that illuminated the night sky for about six months before ...

A powerful and luminous explosion of a star is referred to as a supernova. In the Milky Way, there have been less than 10 instances in recorded history when a supernova has been observed with the ...

A 12th-century poem dedicated to Saladin and a 15th-century chronicle provide new independent testimonies about the stellar explosions of the years 1006 and 1181, crucial for modern astrophysics. In a ...

For six months in 1181, a dying star left a mark in the night sky. The striking object appeared as bright as Saturn in the vicinity of the constellation Cassiopeia, and historical chronicles from ...