What materials were protostars formed from?
Protostar is an early stage in the evolution of a star that usually grows to the point of beginning nuclear fusion and becoming a star by gathering mass. It is made of a contracting cloud of cold and dark interstellar medium (mostly hydrogen gas
Stars begin to form from clouds of gas in space. The cold temperatures and high densities (compared to elsewhere in space, but would be considered a vacuum on Earth) of these clouds allow gravity to overcome thermal pressure and start the gravitational collapse that will form a star.
What causes an interstellar nebula to become a prostar?
Star-Forming Nebula
These knots contain sufficient mass that the gas and dust can begin to collapse from gravitational attraction. As it collapses, pressure from gravity causes the material at the center to heat up, creating a protostar
How protostars are formed?
A protostar is formed as gravity begins to pull the gases together into a ball. This process is known as accretion. As gravity pulls the gasses closer to the center of the ball, gravitational energy begins to heat them, causing the gasses to emit radiation.
How do stars form from the interstellar medium?
Shock waves traveling through the ISM, the interstellar medium, can cause some areas of the molecular cloud to compress into very high densities, high enough to form stars. When molecular clouds collapse as a result of shock waves, they fragment
Do protostars become planets?
As the blanket of gas and dust surrounding a nascent star, or protostar, shrinks over time, a disk forms around it that can give rise to baby planets, or protoplanets
What caused a protostar to grow its mass and eventually form the sun?
The young protostar was a ball of hydrogen and helium not yet powered by fusion. Over tens of millions of years, the temperature and pressure of the material inside increased, jumpstarting the fusion of hydrogen that drives the sun today.
What is interstellar dust made of?
Interstellar dust is made of compounds of various elements such as oxygen, carbon, iron, silicon and magnesium. It originates from the death of stars where stars during their lifetime create metals and explode at their end or blow off their outer layers.
What is interstellar gas made of?
Like the matter in the Sun and most stars, the interstellar gas is composed mostly of hydrogen (about 70% by mass), helium (about 29%), and just a trace (about 1%) of heavier elements such as carbon, nitrogen, oxygen, silicon, iron, etc
Are stars formed from interstellar clouds?
Recipe for Stars and Planets
Star formation happens in interstellar molecular clouds: opaque clumps of very cold gas and dust
Do all stars start as protostars?
A STAR IS BORN – STAGES COMMON TO ALL STARS All stars start as a nebula. A nebula is a large cloud of gas and dust. Gravity can pull some of the gas and dust in a nebula together. The contracting cloud is then called a protostar
Could Jupiter be a protostar?
Jupiter is often called a ‘failed star’ because, although it is mostly hydrogen like most normal stars, it is not massive enough to commence thermonuclear reactions in its core and thus become a ‘real star’.
Is the Sun still a protostar?
The Sun spent about 100,000 years as a collapsing protostar before temperatures and pressures in the interior ignited fusion at its core. And just a few million years later, it settled down into its current form. The life cycle of the Sun has now begun.
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