Astronomical Phenomena
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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What is the sun?
The Sun is a Star. It is an enormous ball of gas
What is sunlight and why is it essential to life?
The sunlight is a vast amount of energy that lets you see the objects around you. It is absorb by plants and enables them to manufacture food via photosynthesis.
What amount of sunlight is absorb by the Earth?
Half the solar light it receives
What is the main source of natural light on Earth?
The Sun
The amount of energy absorb by an object depends on what?
-Intensity of the light -Nature of the object The greater the intensity of light , the more energy the object surface will absorb.
How do light travels from its source?
In a straight line
What are the 3 things that can happen when light encounters an obstacle?
• can be stopped by the obstacle (absorption) • go through almost completely (reflection) • go through only partially
When light energy is stored in an object, in what form can this energy be transformed?
• Thermal energy (Heat) • Mechanical energy (Movement) • Electrical energy • Chemical energy
What does “opaque” mean?
Nothing can be seen through.
When does a shadow form?
A shadow will be form behing an “opaque” obstacle because light doesn’t pass through it
What does “transparent” mean?
Light goes through the obstacle almost completely (can see through)
What does “translucent” mean?
Light goes through only partially, a certain amount is absorb. Light passes through it but what is on the other side cannot be seen (example: sheet of paper)
What is light Reflection?
When light hits a surface and bounces back instead of being absorbed. The surface sends the light back toward you eyes, making it visible (ex: mirror)
What is the temperature at the center of the Sun?
15,000,000 celcius
What is our solar system primarily made up?
Sun and 8 planets Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune
The asteroid belt is between which planets?
Mars and Jupiter
Where are located the Terrestrial planets?
Between the sun and the asteroid belt
What are the Terrestrial planets?
Mercury Venus Earth Mars
What are the gaseous planets?
Jupiter Saturn Uranus Neptune
Define gravity
The natural force that pulls objects toward one another (toward the center of a planet or other massive body)
What are the 2 factors on which gravity depends?
The mass of the objects The distance between the objects
What keeps the Earth in orbit around the Sun?
Gravity (force that pulls the Earth towards the Sun)
What keeps our feet planted on the ground?
Gravity (force that pulls the human towards the center of the Earth)
Define weight and mass
Weight: The force of attraction that Earth exerts on an object Mass: Is the quantity of matter (matière) contained in a body