Asteroids have taken beauty life of many planets. In them Venus is also one. Venus and Earth began their journey together and together they got their surface water , together they built an atmosphere and they would die together. Then how today Venus is so different from Earth? Let's see it:-
Venus was born 4.5 billion years ago. Yeah that's the time when our earth too was born. Let's jump into the topic without any futher ado-
When our solar system started to form planet with the sun already in its centre,he combining cloud particle of hydrogen and helium and colliding asteroids formed Venus .
Venus had water on its surface 3 billion years ago. Wow this means despite the hellish and hot conditions today it could have been a welcoming world in the past. It's just a bit smaller than Earth,, and if water arrived at both planets the same way, Venus could have once hosted oceans on its surface. At some point, however, its atmosphere took off in a runaway greenhouse effect, and now surface temperatures are hot enough to melt lead. Planetary scientists have been trying to figure out what happened to poor Venus to trigger this dramatic transformation. Now simulations have offered an intriguing—if still very early—theory: Venus developed its stifling atmosphere following a collision with a Texas-sized object.A Giant Planetary Smashup May Have Turned Venus Hot and Hellish And made changes deep inside the planet that ultimately affected its atmosphere.
In a simulation of our solar system done by Cedric Gillmann of the Royal Observatory of Belgium, showed that the object must have been 500 miles 1000 miles in size,
energy from the colliding object would have heated the upper mantle enough to melt it. That melted portion would have risen to the surface, spreading into a long, shallow layer just beneath the crust. Water and carbon dioxide within the mantle could then be released to the surface as gases, which could have caused a significant shift in the planet's atmosphere.
Venus did not met exactly the same set as Mars did. When an asteroid hit Mars it only deformed the poles of Mars and increased its degree of tilt but asteroid hitting Venus was so large and collided with so large intensity that it did not only stopped the rotation of Venus but also reversed its direction of spin. and after knowing this I do not think that you will be amazed to know that a day on Venus is of 243 earth days and it completes its revolution around the sun in just 225 days. Astroids are only partially responsible for the destruction of life on Venus. The real murder is the sun. The asteroid that hit Venus 3 billion years ago made rotation of Venus very slow that it could not generate magnetic field any more to defend itself from the Solar winds coming from the Sun does the Solar winds and UV radiation of the Sun destroyed every sign of life on Venus
After few billion years from the formation of Venus the sun expanded up to 10% and this expansion of the sun resulted in heating of the surface of the Venus and this heating was above the the boiling point of water so the the Venus oceans evaporated and as we know that water vapour is a Greenhouse gas and evaporation of oceans of Venus resulted in millions of billions of water vapour in the atmosphere of Venus and this accommodation of water vapour in the atmosphere of Venus increased the surface temperature and atmospheric pressure of Venus to no ends. These water vapour in the atmosphere of Venus was slowly driven out by the Solar winds of the Sun as Venus do not have strong gravitational force . Our earth will suffer a similar fate in future approximately hundred crores years from now. To know what will happen to our Earth hundreds of year from now wait for the next blog.
Next blog is coming soon. ...........