What is a nebula GCSE physics?

A nebula. A star forms from massive clouds of dust and gas in space, also known as a nebula. Nebulae are mostly composed of hydrogen. Gravity begins to pull the dust and gas together.

How is a star formed in a nebula GCSE?

Stars are formed from massive clouds of dust and gas in space. Gravity pulls the dust and gas together to form a protostar. As the gases come together, they get hot. A star forms when it is hot enough for nuclear reactions to start.

How is the solar system formed GCSE?

The Solar System was formed around 4.6 billion years ago from a large cloud of dust and gas, called a nebula . This collapsed under its own gravity, transferring gravitational potential energy to kinetic energy in its particles. As the nebula collapsed it became denser, and rotated more rapidly.

What is a geocentric model GCSE?

A long time ago, astronomers thought that the Earth was the centre of the Universe. This was called the geocentric model.

What is a nebula BBC Bitesize?

What are the stages in the formation of a star from a nebula?

Stage 1- Stars are born in a region of high density Nebula, and condenses into a huge globule of gas and dust and contracts under its own gravity. This image shows the Orion Nebula or M42 . Stage 2 – A region of condensing matter will begin to heat up and start to glow forming Protostars.

How was the solar system formed?

The Sun and the planets formed together, 4.6 billion years ago, from a cloud of gas and dust called the solar nebula. A shock wave from a nearby supernova explosion probably initiated the collapse of the solar nebula. The Sun formed in the center, and the planets formed in a thin disk orbiting around it.

How was the Sun formed step by step?

The sun formed more than 4.5 billion years ago, when a cloud of dust and gas called a nebula collapsed under its own gravity. As it did, the cloud spun and flattened into a disk, with our sun forming at its center. The disk’s outskirts later accreted into our solar system, including Earth and the other planets.

What is geocentric and heliocentric theory?

The geocentric model says that the earth is at the center of the cosmos or universe, and the planets, the sun and the moon, and the stars circles around it. The early heliocentric models consider the sun as the center, and the planets revolve around the sun.

What is the heliocentric?

heliocentrism, a cosmological model in which the Sun is assumed to lie at or near a central point (e.g., of the solar system or of the universe) while the Earth and other bodies revolve around it.

How does a nebula become a main sequence star?

Eventually the temperature reaches 15,000,000 degrees and nuclear fusion occurs in the cloud’s core. The cloud begins to glow brightly, contracts a little, and becomes stable. It is now a main sequence star and will remain in this stage, shining for millions to billions of years to come.