The Force of Gravity and the Birth of the Solar System

The video explains gravity as a universal force of attraction affecting all matter, giving weight to objects and shaping celestial bodies. It describes the formation of the solar system from a dense interstellar cloud, leading to the birth of the sun through nuclear fusion. The process of accretion in the protoplanetary disk formed planets and other celestial objects, with gravity playing a key role in their development and orbits.

What is the primary role of gravity in the universe?

• To repel objects from each other

• To provide energy to celestial bodies

• To attract objects towards each other

• To create light in the universe

Why does an astronaut weigh less in space compared to on Earth?

• Because Earth's gravitational pull is weaker in space

• Because the astronaut's mass decreases in space

• Because the astronaut is moving faster in space

• Because space has no gravity

How did the solar system begin to form according to astronomers?

• Through the collision of two galaxies

• From a dense cloud of interstellar gas and dust

• By the explosion of a nearby planet

• From the cooling of the sun

What process led to the birth of the sun?

• Chemical reaction

• Magnetic attraction

• Nuclear fission

• Nuclear fusion

What is a protoplanetary disk?

• A black hole

• A ring of asteroids

• A type of galaxy

• A disk of gas and dust around a young star

How do celestial objects become true planets?

• By gaining enough mass for their gravity to shape them into spheres

• By orbiting a star

• By having a moon

• By being the largest object in their orbit

What happens to celestial objects that do not gain enough mass to become planets?

• They form new galaxies

• They become stars

• They disappear into space

• They remain as irregularly shaped asteroids and comets