a reply to: knowledgehunter0986
It is possible and it will likely happen within the next one to two billion years naturally anyway as the sun is actually getting slowly hotter as it
get's older, the earth will then become like Venus long before the sun start's to turn into a super giant in it's dying phase as it run's out of
hydrogen in it's core and start's to fuse heavier and heavier element's.
No one know's for certain but Venus may have been earth like until fairly recently, even until under a billion years ago.
Venus is only very slightly smaller than the earth and side by side the two planet's are twins that would to the naked eye look about the same size,
it has no moon though and if you could see the sun which you can not on Venus due to the thick hot atmosphere then the sun would rise in the west and
set in the east, the day on Venus are actually roughly 243 day's long and so are the night's which make's them longer than a year on Venus which is
actually only about a little under 225 days long.
Today the surface of Venus is divided into two continental highland's and a massive single ocean basin or Venusian lowland, the sea's though long ago
boiled off into the atmosphere, most the hydrogen in the water has probably long ago bled away into space and what water remains fall's in constant
downpour's that NEVER reach the ground but evaporate long before they do and those downpours are not water but highly concentrated Sulfuric acid.
It is so hot that it rain's lead sulfide as well which form's metallic snow upon Venus highest mountain's but even there on those highest mountains
it is hotter than a very hot oven.
When the Russians sent a probe to the planet it lasted only a very short time despite being very heavily armored before it gave out but what showed
was a surface were the atmosphere was so thick, dense and hot that it was almost fluid and bent and curved the light that passed through it, if there
was a world modeled after the biblical hell it is Venus.
And Venus may once have been just like earth, potentially even had life but it would have been much different to here and likely was always warmer
than the earth even then.
From about 2.2 billion years ago to about 750 million years ago the earth went through a period of super ice age's collectively known as the Snow
Ball earth period during which time this world of ours probably looked more like the planet hoth from the Star Wars the empire strikes back movie,
during this time the earth may have frozen even to it's equator perhaps several time's with indeterminate inter glacial periods during which life may
have had several false start's and this was in part due to the sun being much cooler back then so likely Venus was also cooler at this time.
But today though we hear about time's when the climate was much warmer in fact the sun is hotter and is getting progressively hotter as it ages, the
earth will therefore become very much like Venus as it does because there is a region around the sun called the Goldilocks zone were it is neither too
hot nor too cold for liquid water to exist upon planet's that exist within it and Venus once existed within the Goldilocks zone but as the sun get's
warmer that zone moves ever further out away from the sun, as the earth bakes mars may become habitable with a little terraforming and in a much
further future humanity or it's descendant's may move to the moon's of Saturn or Jupiter as the sun begins to expand.
But humanity is tipping the balance in such a way that the earth may become uninhabitable far sooner than it has to by making the atmosphere more
like a thermal blanket and trapping the heat of the sun and the natural heat of the earth itself within the atmosphere, if this continues we will
essentially begin to cook our own world and of course become extinct because of our own stupidity.
So your point is correct and so is Mr Hawking's point, Venus may once have been just like the earth but with longer day's and night's and only the
sun to govern it's tides which would have been slow and long tides, if life existed there it would have had very long cycles and perhaps the night
side experienced a long winter and darkness while the day side experienced a long hot summer, region's of life would have migrated near to the
day/night terminator as it moved around the planet or lived near to it's polar region's while the equator would have had a band of desert on it's
continental land mass' that likely baked under the long sun and then froze in the long winter but life may if it existed there have adapted to that
also and perhaps even then cloud's made it rain a lot so maybe it was more jungle like in the day, I suspect venus death was a long and horrible one
if life ever existed there.
edit on 9-7-2017 by LABTECH767 because: (no reason given)