Have you ever wondered, can Earth survive without the sun? If you are a space thinker, then this question surely appeared in your mind at least once.

This question, “Can Earth survive without the sun?” sounds like science fiction or imaginary. But scientists take this topic very seriously, and they studied it very carefully. Scientists came to a terrifying result.

The sun is not just a bright object that only provides heat and sunlight. Instead, the sun controls the earth’s atmospheric temperature, climatic conditions, gravity, and food chains, and it also provides energy to all the living beings. If the sun suddenly disappeared, then the earth would change suddenly.

In this article we all discuss the Sun, Earth, and their relation. We will also discuss our main goal: “Can Earth survive without the sun?”

First: What Happens The Moment When the Sun Disappears?

If the sun disappeared suddenly, the effects would not be instant. This fact shocked many people, but it happens because sunlight takes 8 minutes 20 second to reach the earth. After the sun vanished, everything would seem like normal for 8 minutes 20 seconds. But after the last ray of sunlight reached us, everything would change suddenly.

The whole world would be engulfed in darkness. Not a single place on earth remains lighted. Only artificial lights and the faint glow of the stars remain. The moon would also become invisible to us because it shines by reflecting the sunlight. Earth started floating in the complete darkness.

What Would Happen to Gravity?

The sun does not only provide sunlight or heat. It also provides gravity that keeps the earth bound to our solar system and makes it keep revolving around the sun. According to Einstein’s theory of relativity, the change in gravitational field or the speed of gravitational waves is equal to the speed of light. So after 8 minutes 20 seconds, Earth would stop feeling the sun’s gravitational pull. Without the sun’s gravitational pull, Earth stops revolving around the Sun, and it starts moving in a straight line into deep space. This does not destroy our planet, but without the sun’s gravity, Earth would not be bound to our solar system, and it would no longer be part of it.

What Would Happen to Temperature?

If the sun disappears suddenly, survival becomes extremely difficult. The sun provides heat, and it maintains the temperature of the earth’s atmosphere. After the sun vanishes, the temperature begins to drop quickly. In the presence of the sun, the earth’s temperature is about 15°C (59°F). This temperature range is suitable for the earth.

Without the sun, the temperature of the earth drops below freezing within a few days. The temperature of the earth would fall to -17°C (1°F) within a week. And within a year the temperature of the earth’s surface would drop around -73°C (-100°F). 

The ocean would start freezing from the top down. As the water holds heat, the deep-down layers of water stay in liquid form for a longer time. But the surface freezes completely. Over time, our planet, which is full of life, would turn into a frozen planet. Earth becomes an extremely cold planet where survival would be nearly impossible. In the journey of understanding this question, “Can Earth survive without the sun?” I hope you can understand; alone, temperature creates a huge problem in the survival.

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What Happens To Plants And Oxygen?

If the sun disappeared, then plants would be affected immediately. Because plants are totally depend on the sunlight for photosynthesis. Photosynthesis is a process in which plants make their food. During this process plants turn carbon dioxide and water into their food (glucose) with the help of sunlight and release oxygen as a byproduct in the atmosphere. Without sunlight, photosynthesis would stop instantly. As plants store some food, they would survive a few days or weeks. Small plants or crops would die first, but large trees may survive a little longer. After some time the temperature drops down, and all the vegetation and plants would be completely destroyed.

As a result, the food chain collapsed. As there are no plants, they do not release oxygen in the atmosphere. This affects animals and humans. When there are no plants, herbivores die first, then carnivores, and then humans.

This also results in a lack of oxygen in the earth’s atmosphere, but it takes longer, so our first problem is a shortage of food and extreme cold temperatures. Life on Earth directly or indirectly depends on solar energy.

Would Humans Survive?

After the sun disappears, everything seems normal for 8 minutes and 20 seconds. Then earth would be engulfed in darkness completely. The temperature falls down at freezing point. All the plants stop photosynthesis and die after some time. Since humans depend on plants directly or indirectly, the food chain would be destroyed completely. Food and temperature are the biggest problems. Humans would not survive in these conditions, but humanity does not destroy instantly.

Humans would survive for a limited time in special environments like underground bunkers, nuclear-powered facilities, geothermal energy stations, and deep underground areas where heat still exists. Scientists believed some people could survive for a certain time with artificial light and stored food resources. But humans would not survive for a long time with limited resources. Over time, Earth turns into a frozen planet where the existence of life would be impossible.

For humans, “Can Earth survive without the sun?” The answer is no.

Would Earth completely freeze?

Now people wonder, would Earth completely freeze? If someday the sun vanished, the earth’s temperature would begin to fall. But the earth would not become a solid ice ball suddenly. For the first few days, the temperature drops quickly, and after some weeks, the temperature falls below freezing point. After a year, the earth’s surface temperature could fall to around -73°C (-100°F). And after some time, it drops even more. The oceans begin to freeze from top down. Over time a thick layer of ice forms in oceans. But the ocean does not freeze completely because the earth has internal energy due to radioactive decay in its core. The deep layer of the ocean remains in liquid form because of the geothermal energy of the earth. Earth would become a frozen planet, but still it has some water in liquid form in a deep underground ocean. So Earth could look completely frozen from space, but it does not freeze completely solid ice from the inside.

Could Earth Drift Into Another Star System?

If the sun disappears, the earth lost the sun’s gravitational pull so it could move freely in deep space. Because the sun’s gravity bound our earth to orbit around the sun and make it part of our solar system. So, could Earth drift into another star system? In theory, the answer is yes, but if we see practically, there is a very low possibility. To become part of another star system, Earth would have to pass very close to it. The speed of Earth would need to be slow enough for that star’s gravity to capture it. So in simple terms, earth could drift into another star system; it is possible theoretically, but there would be very little chance to make it possible.

Conclusion

In this article we all discuss “Can Earth survive without the sun?” Without the sun, Earth would not be destroyed completely; instead, it would start floating in deep space. But all the living creatures on the earth would be wiped out. The temperature of the earth’s surface drops below the freezing level. And all the plants, animals, and humans would not be able to survive for long without sun. Only the smallest forms of life, like microbes, might survive in deep underground darkness. So without sunlight, life on earth would not be possible. The energy that we obtain from the sun is very essential for the existence of life on the earth. Hence, this is the true answer to “Can Earth survive without the sun?”

FAQ

1. How long can the earth survive without the sun?

If the sun disappeared suddenly, the earth would not be destroyed. It would survive for billions of years. But life on earth would not survive without the sun for a long time.

2. What happens if the earth has no sun?

If the earth had no sun, the earth would be engulfed in complete darkness. Without sunlight, plants would not be able to perform photosynthesis, and they would die in a short time. The temperature would drop to extreme cold. These conditions are not suitable for the survival of life. The global food chain would be collapsed. Over time, Earth turns into a frozen and lifeless planet floating in deep space.

3. Can human beings survive without sunlight?

The answer is “no.” Humans would not survive without sunlight. After the sun vanished, plants died after a short time because they use sunlight for making their food. The temperature of the earth would also fall down to extreme cold. The major problems for the human’s survival are shortage of food and extreme cold temperature. The oxygen also started to decline in the atmosphere, but it takes some time. So our first problems would be shortage of food and extreme temperature. That’s why humans would not survive without the sun. This also helps to understand “Can Earth survive without the sun?”