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Last updated date: 02nd Dec 2023
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MVSAT Dec 2023

Which object in space produces its own light?
a) Planet
b) Star
c) Moon
d) Comet

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Hint: Stars make their light, just like our Sun. However, the stars are very, very far away from our solar system, so they seem to be very small to us, even though up near, they are significant. The stars seem different because they are distant. Moreover, the light from the stars travels a very long distance to reach us.

Complete step-by-step solution:
The moon does not have its light. We observe the moon because the sunlight falling on it gets reflected toward us. Thus, we see only that part of the moon that reflects light keeps on changing daily. This occurs because the moon rotates around the earth. This moon also revolves around the sun. Therefore, we see phases of the moon.
Comets are mostly made of rocks, dust, and ice, the pieces from the time the solar system was made over $4.6$ billion years past. People believed comets as "long-haired" stars that would seem unpredictably in the sky in the far past. Comets may be infrequently forced into orbits closer to the sun and the Earth's neighbourhood due to the gravity of other planets. Comets do not possess the light of their own and what humans can perceive from Earth is the sunlight reflecting off the comet and the energy liberated by the gas molecules after it is occupied by the sun.
The planets are much near inside our solar system. Although the planets are much more minor than the stars, planets look to be about the same dimension as the stars because they are familiar. Planets do not produce their light. They reflect the Sunlight in the same way our moon reflects Sunlight. A planet is a great object that revolves around a star. For the planet, an object must be heavy enough for gravity to have compressed it into a spherical shape. It must also be big enough for gravity to have mopped up any rocky objects from its path to the star.
Stars twinkle, but planets do not because they do not possess their light. They are similar to the moon. They reflect Sunlight. A star is produced when a cloud of many different gases, leading to hydrogen, gets together. The gas particles pull each other and slowly get compressed to form a vast mass of gases. Moreover, as this mass rises, the temperature inside increases until it bursts like a bomb. This explosion produces a gas called helium, which is dangerous. The helium becomes its fuel, and it remains burning. The heavier stars inflame more furiously. They have higher explosions, where more helium is discharged, giving more fuel.
Option (b) is correct.

Note: Planets start to form when a solid cloud of dust and gas spins around a newly created star. Gravity makes the bits of matter clump together. Slowly, these clumps collect and grow. Finally, these clumps become planets. The Sun does not twinkle. It burns down on us. If stars were near us, they would have also burned down on us or even fired us down. Very few of the lights finally manage to give us. Besides, it moves through the earth’s atmosphere before contacting us. As the light penetrates the atmosphere, impurities interfere with its way. So, sometimes it is apparent, and sometimes it is not. This phenomenon is called twinkling.