Gr 9 NATURAL SCIENCES: Ch 4.5 The birth of a star

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What is the temperature required for nuclear fusion reactions to begin in a star?

5 million degrees Celsius

50 million degrees Celsius

10 million degrees Celsius (correct)

1 million degrees Celsius

What process prevents further contraction of a star?

Gravitational Force

Galactic Rotation

Nuclear Fusion (correct)

Stellar Wind

What is emitted by a young star that gradually blows away the surrounding gas and dust?

Galactic Wave

Stellar Wind (correct)

Solar Flare

Cosmic Ray

What is the term for the birthplaces of stars?

Nebulae Signup and view all the answers

What is the early stage of a star's formation called?

Protostar Signup and view all the answers

What is the process that powers stars?

Nuclear Fusion Signup and view all the answers

What is the outflow of charged particles from a star called?

Stellar Wind Signup and view all the answers

What can be formed in the surrounding gas and dust of a young star?

Planets Signup and view all the answers

What is the term for a large cloud of gas and dust in space where stars are born?

Nebula Signup and view all the answers

What is the process by which nuclei of light elements combine to form heavier elements, releasing energy?

Nuclear Fusion Signup and view all the answers

What is the stage of a star's life where it is not yet hot enough for nuclear fusion?

Protostar Stage Signup and view all the answers

What is the term for a group of stars forming a recognizable pattern?

Constellation Signup and view all the answers

What is the initial stage of star formation?

Initial Collapse Signup and view all the answers

What is the term for streams of charged particles emitted from a star?

Stellar Wind Signup and view all the answers

What is the result of the fragmentation of a collapsing cloud?

Formation of multiple stars Signup and view all the answers

What is the main trigger for the collapse of a nebula?

A passing through a spiral arm of a galaxy Signup and view all the answers

What is the typical mass range of nebulae?

100,000 to 2 million times that of the Sun Signup and view all the answers

What happens to the clumps as they contract during the formation of stars?

They heat up and flatten into disk shapes Signup and view all the answers

What is the duration of the protostar stage?

50 million years Signup and view all the answers

What is the result of the increasing mass of a protostar?

An increase in temperature at its core Signup and view all the answers

What is visible to the naked eye under dark skies in the constellation of Orion?

The Orion Nebula Signup and view all the answers

What is the term for the process of gradual change or development of stars?

Stellar Evolution Signup and view all the answers

What is the result of nuclear fusion reactions in a star?

The release of vast amounts of energy in the form of heat and light Signup and view all the answers

What is the primary function of stellar winds in a young star?

To gradually blow away the surrounding gas and dust Signup and view all the answers

What is the composition of a nebula?

Gas and dust Signup and view all the answers

What is the term for the stage of a star's formation before nuclear fusion begins?

Protostar Signup and view all the answers

What is the energy source that powers a star?

Nuclear fusion Signup and view all the answers

What is the effect of nuclear fusion on a star's contraction?

It prevents further contraction Signup and view all the answers

What is the term for the outflow of charged particles from a star?

Stellar wind Signup and view all the answers

What is the location where stars are born?

Nebula Signup and view all the answers

What is the primary mechanism by which a protostar becomes a main-sequence star?

Nuclear fusion ignition Signup and view all the answers

Which of the following is NOT a characteristic of a nebula?

Is a stable, long-lived structure Signup and view all the answers

What is the effect of stellar winds on the surrounding interstellar medium?

It disperses the surrounding gas and dust Signup and view all the answers

What is the ultimate energy source that powers a star?

Thermal energy released from nuclear fusion Signup and view all the answers

What is the term for the process by which a protostar contracts and heats up?

Kelvin-Helmholtz contraction Signup and view all the answers

What is the most likely outcome of a nebula's collapse?

Formation of a star or multiple stars Signup and view all the answers

What is the primary function of nuclear fusion in a star?

To release energy and maintain the star's temperature Signup and view all the answers

What is the expected outcome of a star's contraction during its protostar stage?

The star's core will heat up Signup and view all the answers

What is the primary reason for the formation of a protostar at the center of a collapsing clump?

Due to the increased density at the center of the clump Signup and view all the answers

What is the typical shape of a collapsing clump as it contracts during the formation of stars?

Disk Signup and view all the answers

What is the primary trigger for the collapse of a nebula?

Passing through a spiral arm of a galaxy Signup and view all the answers

What is the primary effect of the increasing mass of a protostar?