If the sun will disappear then the whole solar system heatness and brightness will be gone as the sun provides the heat and light to the solar system. More over the solar system will be freeze and no more living things can survive. But luckily the sun will never be disappeared because our sun is the red hot star and after this it will go through the white dwarf phase, then super nova and then it will become a black hole. For each of the changes in the phases it will take 10 million years.

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Sudden Disappearance of the Sun
If the sun were to suddenly disappear, it would have catastrophic consequences on Earth and all life forms inhabiting it. Let's explore some of the key effects:

1. Immediate Darkness:
- The first noticeable impact would be the sudden darkness that would envelop the planet. The absence of sunlight would plunge the Earth into complete darkness.

2. Drastic Temperature Drop:
- Without the sun's heat and light, temperatures on Earth would plummet rapidly. This drop in temperature would lead to freezing conditions across the globe.

3. Ecosystem Collapse:
- The disappearance of the sun would disrupt the entire ecosystem. Plants would be unable to photosynthesize, leading to a collapse in the food chain. This would result in widespread famine and death.

4. Loss of Atmosphere:
- The sun plays a crucial role in maintaining Earth's atmosphere. Without its energy, the atmosphere would gradually dissipate into space, leaving the planet vulnerable to cosmic radiation.

5. Earth's Orbit:
- The sudden disappearance of the sun would also affect Earth's orbit. The gravitational forces that keep our planet in its orbit would be disrupted, potentially causing Earth to drift into space or collide with another celestial body.
In conclusion, the sudden disappearance of the sun would spell doom for life on Earth. It would lead to darkness, extreme cold, ecosystem collapse, loss of atmosphere, and disruption of Earth's orbit. The consequences would be catastrophic and irreversible.