Las Pionner 10 y 11, lanzadas en 1972 y 1973, fueron las primeras sondas enviadas al Sistema Solar exterior. Diez años después, los científicos descubrieron que los aparatos se estaban desacelerando inexplicablemente, algo que desafiaba las leyes de Newton. Hubo que esperar hasta comienzos del presente siglo para establecer que las sondas se ralentizaron por una irradiación de calor consecuencia de la mala calidad de la pintura de los generadores eléctricos.#pionner#sonda#newton#calor#sistemasolar
#TBT to las Summer when @kinginale took this shot of the @iss in 🇮🇹 ⠀⠀ ⠀⠀
Mille grazie for sharing it with us, Alessandro!⠀⠀
👨🚀 Tomorrow, scheduled at 12:30 GMT, @thom_astro & @astro_kimbrough will be heading out of the @iss on their second spacewalk together, and we have a challenge for you!⠀⠀
Follow the link in our bio to track the ISS, if its orbit passes above your head during the spacewalk, we want you to capture the Station.⠀⠀
Do you accept our challenge?⠀⠀
Remember to tag your posts on @instagram using #yourESA so we can see them.
Credit to @youresa
It would be very egocentric to believe that our solar system is special in the fact that we have planets, and to even assume we are the only one with H2O present. Observations from modern telescopic technology shows that there are over 3,000 known planets and possibly billions of undiscovered planets in our milky way alone, not counting the hundreds of billions of galaxies. But how do planets form in the first place?
When you go back to the birth of our sun, it started out with a large disk of gas and heavier elements called a proto planetary disk, a mixture of silicates, water vapor, water ice, hydrogen, methane, etc. These elements in the dust cloud are like ingredients for a cake, they cook differently depending on the combination of ingredients and the temperature of the oven. Becuse of this, Not only are planets diverse in our solar system, but we are now learning that no 2 planets are alike in the universe. Each planet forms from pure potential depending on conditions.
Planets start off very small, in the beginning they are nothing but atoms, those atoms attract to eachother with there electic charges, those atoms bind together overtime to create grains of dust, and now gravity does the work, each dust grain coalescing to form rocks and boulders called planetesimals, and this process continues for hundreds of millions of years. The early solar system was like a cosmic bumper car game, everything colliding gaining more mass. Its survival of the fittest so the biggest planets survive, and there were possibly more then a hundred planet sized objects out to destroy eachother, all inner planets have a violent history with planetary collusions. Mercury used to be larger but had its crust and mantle blown off completely in a huge collusion, venus rotates in the opposite direction and it is thought to be because a huge collusion reversed its rotation, earths moon is the leftover result of a collusion with a mars size planet, and mars' northern hemisphere has a thinner crust then the southern and is because of a collusion.
The solar system as it is now is the ending result and has settled down a bit, all planets orbiting the sun consistently like clock work.