News Exercise #280

1. Numbers
How far away is it?
How does that black hole’s mass compare to our sun? .
How many radio telescopes were combined to create this image?
2. What indirect evidence had there been up to now?
3. What is the definition quality of the radio telescopes’ capability?
4. As the Oxford doctor explained, what is the reason that the centre of the image is black, and why is the surrounding area orange?

Answers:
1. Numbers
How long ago was evidence of a black hole found? 101 years ago evidence was seen, and einstein predicted black holes at that time.
How far away is it? 55 million light years away from Earth
How does that black hole’s mass compare to our sun? It is over 6 billion times the mass.
How many radio telescopes were combined to create this image?
8 radio telescopes around the world.

2. What indirect evidence had there been up to now?
Stars had been seen “whizzing around” (moving in an orbital pattern) the heart of galaxies.

3. What is the definition quality of the radio telescopes’ capability?
It is like reading a newspaper in New York from a London street.

4. As the Oxford doctor explained, what is the reason that the centre of the image is black, and why is the surrounding area orange?
Within the event horizon nothing can escape, including light, and so it is black. We can see matter outside the event horizon that is very hot due to its high speed of orbit around the black hole.