Quiz · Inside the World of Black Holes

Question 1What is the main subject of this talk about black holes?

How new stars are born inside galaxies The dangers that black holes pose to astronauts What black holes are, how they form and how scientists study them The life and career of Albert Einstein

Question 2What is the event horizon of a black hole?

The bright ring of X-rays around a star The exact centre of a distant galaxy The path followed by a collapsing star The invisible boundary that nothing can cross and return from

Question 3How do astronomers study black holes if they cannot observe them directly?

By sending small probes inside them By studying their effects on nearby stars and glowing gas By listening to radio signals they broadcast By photographing them every single day