The theory of predicts that our will exhaust its and become a in about 5 billion years, becoming thousands of times more luminous and losing roughly 30% of its current mass Ignoring tidal effects, the Earth would then orbit 1.7 AU (250,000,000 km) from the Sun at its maximum radius. This would allow the Earth to escape being enveloped by the Sun's now expanded and thin outer atmosphere, though most life, if not all, would perish due to the Sun's proximity
However, a more recent study suggests that the Earth's orbit will decay due to the effects, causing it to enter the Sun's expanded atmosphere and be destroyed in 7.6 billion yearsBefore being swallowed by the Sun, the Earth's oceans would evaporate, and the Earth would finally be destroyed by Various risks exist for but not all are equal. Risks can be roughly categorized into six types based on the scope (personal, regional, global) and the intensity (endurable or terminal).
The following chart provides some examples: Many scenarios have been suggested. Some that will almost certainly end life on Earth are certain to occur, but on a very long timescale. Others are likely to happen on a shorter timescale, but will probably not completely destroy civilization. Still others are extremely unlikely, and may even be impossible. For example, writes:
Some foreseen hazards (hence not members of the current category) which have been excluded from the list on grounds that they seem too unlikely to cause a global terminal disaster are: solar flares, supernovae, black hole explosions or mergers, gamma-ray bursts, galactic center outbursts, buildup of air pollution, gradual loss of human fertility, and various religious doomsday scenarios.
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