Inside a black hole
Chapter 1
The boundary of no return
View / Create
Answer
Chapter 2
The descent into extreme gravity
View / Create
Answer
Chapter 3
The heart of the mystery
View / Create
Answer
Chapter 4
The final fade and cosmic legacy
View / Create
Answer
YOUR GOAL
Master of Inside a black hole
Ch 1 · The boundary of no return
Fun Fact
Black hole size: If our Earth collapsed into a black hole, it would shrink to the size of a single glass marble.
Glossary
event horizon (noun)
A theoretical limit around a black hole beyond which no light or radiation can escape. In 1916, Karl Schwarzschild first calculated this gravitational threshold using Albert Einstein's equations of general relativity.
A theoretical limit around a black hole beyond which no light or radiation can escape. In 1916, Karl Schwarzschild first calculated this gravitational threshold using Albert Einstein's equations of general relativity.
Quiz
What is the maximum mass limit of a stable white dwarf star, calculated by Subrahmanyan Chandrasekhar in 1930?
Quiz
What is the boundary around a black hole beyond which nothing, not even light, can escape?
Quiz
Why does the light from an object falling into a black hole shift toward the infrared spectrum?
Quiz
In 2019, which global telescope network captured the first-ever image of a black hole's shadow?
Quiz
Which German physicist first calculated the size of a non-rotating black hole's boundary in 1916?
Quiz
To a distant observer, what happens to the clock of an astronaut falling toward a black hole?
Quiz
What is the name of the supermassive black hole photographed in 2019 in the galaxy M87?