This week in lab, we all shared our presentations.
2. Lifecycles of Stars ⭐
Stars are born in clouds of gas and dust called nebulae.
Small stars become red giants and then shrink into white dwarfs.
Big stars explode as supernovae and can turn into black holes or neutron stars.
3. Galaxies 🌠
Galaxies are huge groups of stars, planets, and gas held together by gravity.
Types include spiral (like our Milky Way), elliptical, and irregular.
There are billions of galaxies, each with billions of stars.
4. Origin of the Earth 🌏
Earth formed 4.5 billion years ago from gas and dust around the Sun. Over time, it became a solid planet with water, air, and life.
5. Black Holes 🕳️
Black holes are areas in space with super strong gravity—so strong that not even light can escape. They form when big stars collapse.
6. Exploration of Space 🚀
Past: Humans sent satellites, landed on the Moon, and explored planets.
Present: We study Mars, use space telescopes, and even have private space travel.
Textbook key points:
Earth formed 9 billion years after the Big Bang.
The Moon affects Earth’s tides due to gravity and has no atmosphere, causing extreme temperatures and craters.
Space exploration continues to expand our understanding of the universe.
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