i) Why are distances in space often measured in light years? Ans:A light year is a large unit equal to the distance traveled by light in one year. Hence distance in space is very large and measured in light years.
ii) Is our sun in motion through space?Ans:Yes, our sun is in motion through space. In fact, our whole solar system orbits around the center of the Milky Way galaxy with an average speed of 828000 km/h.
iii) What is the source of the sun’s energy?Ans:The nuclear fusion reaction is the source of the sun’s energy. Fusion occurs when protons of hydrogen atoms violently collide in the sun's core to create a helium atom.
iv) Why the sun will not become a black hole?Ans:The sun would need to be about 20 times more massive to end it as a black hole. A black hole is a region where gravity is so strong that nothing, no particle even light can escape from it.
v) What are the advantages of designing space probes for not to return back to earth?Ans:Advantages of space probes:
- It is not required to carry astronauts. Ans
- It can overcome any harsh atmospheric conditions.
- It is equipped to carry other self-sufficient devices to increase the field of investigation such as water, temperature, and electromagnetic radiation.
| 
){kind=link}
0 Comments
Start Tuition (in Pakistan or Abroad) from Experienced Online Teachers.
Contact WhatsApp for tutoring and Assignment help on +923339719149