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" ... Based on the life-cycle of stars like our Sun, scientists have speculated about Earth's future evolution. In 1.6 billion years, the now hotter Sun will evaporate all the oceans of Earth, and the rising radiation will change the chemical composition of the atmosphere. In 7.5 billion years, our Sun will expand to become a Red Giant. As the distance between Sun and Earth decreases, the gravitational pull exercised by the Sun on our Earth increases. Earth will eventually become tidally locked – in which one hemisphere of the Earth is perpetually facing the Sun while the other remains shrouded in eternal darkness. On the dark side of Earth, without an insulating atmosphere swept away by powerful solar storms, the temperature will drop to -400°F. On the sunny side, the temperature will rise to 4,000°F. Basalt, one of the most common rocks on Earth, melts at 2,000-4,000°F. ... "
" ... Mercury’s rotation rate was also found to be an orbital resonance with 2 orbits for every 3 rotations, rather than tidally locked. ... "
" ... Our planet spins on its axis but isn't tidally locked, so that we have days and nights throughout the year. We have a large moon to stabilize our axial tilt. We have a large world (Jupiter) outside of our frost line to shield the inner planets from catastrophic strikes. When we think about it in these terms, looking for a world just like Earth — a proverbial 'Earth 2.0' — seems like a no-brainer of a decision. ... "
" ... That means the earliest stars, which don’t have those heavier elements, are no good for life, meaning that life had better odds of arising later on. But there’s a drawback to this approach: as far as we understand it, the lightest and most common stars in the Universe, the low mass red dwarfs, are unsuitable for life, as their rocky planets should become tidally locked, will be subject to flaring and atmospheric stripping from the central star, and receive disproportionate amounts of ionizing radiation. ... "
" ... This spectacular image was created with composite Spitzer and Hubble data, and shows a tidally... [+] distorted galaxy, rich in gas and actively forming new stars, merging with an old, gas-free elliptical galaxy made up of older stars. Poetically, this is called 'the penguin and the egg.' ... "