Let's analyze each statement one by one and determine whether it is true or false.
1. The sun is the closest star to the earth.
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True: The sun is indeed the closest star to the Earth. It is approximately 93 million miles (about 150 million kilometers) away from the Earth, which is the average distance between them (known as an Astronomical Unit, AU).
2. The sun orbits the earth.
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False: This statement is incorrect. The Earth orbits the sun, not the other way around. The sun is at the center of our solar system, and the planets, including Earth, revolve around it due to gravitational forces.
3. The core is the hottest part of the sun and of the solar system.
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True: The core of the sun is the hottest part of the sun and, in fact, the hottest known region in the solar system. The temperature at the sun's core is estimated to be around 15 million degrees Celsius (27 million degrees Fahrenheit). This extreme heat is generated by nuclear fusion reactions where hydrogen atoms fuse into helium.
4. The sun is the center of the solar system and its largest object.
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True: The sun is located at the center of the solar system and is also the largest object in it. It contains about 99.8% of the total mass of the solar system. All planets, moons, asteroids, comets, and other objects orbit the sun.
5. The sun is 1 billion kilometers from the earth.
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False: The average distance between the Earth and the sun is approximately 150 million kilometers (or about 93 million miles), which is much less than 1 billion kilometers. One billion kilometers would be roughly 6.67 times the actual average distance.
Final Answers:
1. True
2. False
3. True
4. True
5. False
Explanation Summary:
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Statement 1 is true because the sun is the closest star to Earth.
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Statement 2 is false because the Earth orbits the sun, not the other way around.
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Statement 3 is true because the sun's core is the hottest part of the sun and the solar system.
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Statement 4 is true because the sun is both the center and the largest object in the solar system.
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Statement 5 is false because the actual average distance between the Earth and the sun is much less than 1 billion kilometers.
Final Answer Boxed:
\[
\boxed{
\begin{array}{ll}
1. & \text{True} \\
2. & \text{False} \\
3. & \text{True} \\
4. & \text{True} \\
5. & \text{False} \\
\end{array}
}
\]
Parent Tip: Review the logic above to help your child master the concept of 4th grade science worksheet.
