Snc 1D0 – Chemistry Take Home Quiz

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ExamReview - Unit 4 Space G9 Sem1 ANSWER

Definitions or Explanation Key Term

Space Unit Exam Review

Match the key terms from the word list with the following definitions or explanations.

asteroid belt asteroid comet astronomical unit black hole

celestial objects galaxy light year meteor meteoroid

meteorite nebula neutron stars nuclear fusion Oort cloud

solar system star supernova Universe

Definitions or Explanation	Key Term
Objects we can see in the sky that are not man-made.	celestial objects
The average distance between the Sun and Earth.	astronomical unit
The distance that a beam of light can travel through space in one year.	light year
The process in which the nuclei of atoms fuse together and form larger atoms, and an enormous amount of energy is released.	nuclear fusion
The Sun together with all the planets and celestial objects are held by the Sun’s gravitational attraction and orbit around it.	solar system
A hot ball of plasma, an electrically charged gas, that shines because nuclear fusion is taking place in its core.	star
A region of rocky debris that forms a ring all the way around the Sun at a distance of about 3 AU.	asteroid belt
A celestial object made of ice and dust that orbit the Sun, and as it approaches the Sun, a gas tail and a dust tail will form.	comet
A meteoroid that enters Earth’s atmosphere and begins to burn up as a result of friction.	meteor
A piece of metal or rock in the solar system that is smaller than an asteroid, and has no fixed path.	meteoroid
A piece of metal or rock that crashed to the Earth’s surface and created a crater.	meteorite
A small celestial object in orbit around the Sun, especially in asteroid belt; it is smaller than a planet but larger than a meteoroid.	asteroid
The most distant region of the Solar system that consists of billions of fragments of ice and dust, and a major source of comets.	Oort cloud
Everything that physically exists: entirety of space and time, and all forms of matter and energy.	Universe
A collection of hundreds of billions of stars held together by gravity.	galaxy
Star’s explosion, caused by the gradual build-up of heavy elements in the star’s centre, resulting in the core’s collapse.	supernova
A large cloud of dust and gas.	nebula
A region of space where gravity is so strong that nothing, not even light, can escape.	black hole
When a star’s core becomes a ball of densest mass after the supernova.	neutron stars

Define

a) astronomical unit

The average distance between the Earth and the Sun

b) light year

The distance that light can travel through space in one year

a) What is Solar Nebula Theory?

The Sun and the solar system formed from the collapse of a cloud of gas and dust, under the force of gravity. The centre becomes very dense and hot, formed protostar. When protostar becomes hot enough, nuclear fusion occurs and the star begins to shine. Some of the remaining of dust and gas lumps together and form planets.
b) List three supporting evidence of solar nebula theory.

Planets orbits the Sun in the same direction
Most planets orbits the Sun in the same plane
Most planets rotate in the same direction

State the different stages of the life cycle of

a) Low mass stars

b) Intermediate / medium mass stars

c) High mass stars

c) High mass stars

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