Class 10 Science | Future of the Universe

Science and Technology, Grade 10 · Unit 12

Future of the Universe

Speed versus gravity · Critical density · Open, flat, closed

By the end of this lesson you can

🚀

Use a rocket to explain the balance of speed and gravity

⚖️

Define critical density

🌌

Tell apart open, flat and closed universes

📈

Read the graph of the three universes

Activity 12.4

The future of a rocket

GRAVITY FIRST

Gravity reaches zero first: the rocket goes away forever

SPEED FIRST

Speed reaches zero first: the rocket falls back

TOGETHER

Both reach zero together: the rocket stays put

The notes are free to read in full.

Presenter notes: Today we ask what will finally happen to the universe. The answer lies in a contest between speed and gravity.