Above the Arctic Circle, an extreme case is reached where there is no daylight at all for part of the year – up to six months at the North Pole itself, which is known as a “polar night”.
In the southern hemisphere, the situation is exactly reversed, with the South Pole experiencing a “midnight sun” – i.e. This will result in a serious shift in Earth’s habitable zone, as the increased radiation will have a dire effect on life and lead to the loss of the oceans.
By 5 billion years from now, the Sun will become a red giant, expanding to 250 times to a radius of roughly 1 AU (150 million km).
In this scenario, Earth will move to an orbit of 1.7 AU (250 million km) from the Sun, will escape envelopment, but will also be rendered completely uninhabitable.
In terms of its orbit, Earth has a very minor eccentricity (approx.
0.0167) and ranges in its distance from the Sun from 147,095,000 km (0.983 AU) at perihelion to 151,930,000 km (1.015 AU) at aphelion. semi-major axis) of 149,598,261 km, which is the basis of a single Astronomical Unit (AU). Though technically a full day is considered to be 24 hours long, our planet takes precisely 23h 56m and 4 s to complete a single sidereal rotation (0.997 Earth days).
And in the meantime, we can only hope that our presence here on Earth doesn’t ruin it.
From the vantage point above the north poles of both the Sun and Earth, Earth orbits the Sun in a counterclockwise direction.Nevertheless, given that it is where all terrestrial life as we know it originated, coupled with the fact that it is the only habitable planet known to us, Earth is likely to remain our spiritual and physical home for many eons to come.One can only hope that by the time it does become uninhabitable, we will have long since gone extinct, or evolved to the point that we no longer have to worry about dying along with it.But the most remarkable thing about our planet is its diversity.Not only are there an endless array of plants, animals, avians, insects and mammals, but they exist in every terrestrial environment.Within 1 billion years, all water will be gone and the average surface temperature will reach 70 °C (158 °F).