Hey there! I'm Grace, your science teacher. In the last lesson, we learned about the life cycle of a star. Do you still remember what a star turns into when it "dies"?

That's right Parker! It turns into a black hole! A black hole is formed from the remnants of a massive star that has ended its life cycle.

If you looked at a black hole, what you'd really be seeing is the event horizon. The event horizon is like the edge of a black hole.

Once something crosses it, there's no turning back! You need to be travelling faster than the speed of light to escape. In other words, it's impossible. It's the point of no return because the gravitational pull is too strong.

At the very center is the singularity, a point where gravity may be indefinitely intense, meaning all it's mass is concentrated into a single point in space, with no surface or volume.

Okay Lisa, imagine squeezing a whole mountain into a tiny dot, that's how dense the singularity is! Got it? So,

what would happen, if we fell into a black hole?

The experience of time is different around black holes, from the outside, you seem to slow down as you approach the event horizon,

so time passes slower for you. At some point, you would appear to freeze in time, slowly turn red and disappear.

Okay, it's time for quick quiz. Let's see what you've learned! The first one to answer gets an extra 5 marks! Here's the question: Which part of a black hole is known as the point of no return?

1. Singularity,

2. Event Horizon,

or 3. Accretion Disk?

That's right, it's the Event Horizon! Good job, Jennie!

And that's it for today's lesson! If you have any questions, feel free to reach out to me. Don't forget to revise and complete your assignments! See you next time!