which planet in our solar system

The oldest planets would be the gas planets. Existing in areas where water existed in ice form allowed these planets to accrete dust and rock particles at a faster rate than the inner rock planets. This partially explains their size. They formed faster, thus their mass had more gravity to attract matter more easily than the smaller inner planets. Since the Solar System formed from the same nebula, we are not talking about a long time between the formation of the gas planets and the rocky planets. Just long enough for them to accrete matter a little more quickly.

On a geological timescale, Venus appears younger than Earth. Today, the crustal plate on Venus appears to be one single plate which is indicative of pretectonics activity as would already been seen on Earth. Although surface heat due to runaway greenhouse gas effects play a part in the geology of Venus, the planet did undergo a complete resurfacing about 400 million years ago.

My guess would be Jupiter formed first and Venus is still undergoing geological change making it the youngest.

Forget about God!

The solar system was created just the same as the rest of the universe. But according to scientific knowledge, they were all created at the same time more or less, give or take one year and it makes no real difference. So... as they are also different sizes, smaller planets could have formed earlier than the biggest. So... your question is very interesting, but still without an answer. Not even Nasa has the answer. If you want to know more about the creation of the solar system, try History Channel "The Universe" and you will see. Matter spinned around a gravity nucleus (the Sun) and little by little planets took shape, got cold and became planets, but too know exactly wich was formed first... may be even impossible as it happenned 5 billion years and an exact date would not be possible to find.

You can try also www.space.com

Good luck!

hm mm...a travel question. let's see... which planet in our solar system revolves fastest around the sun? I believe that would be Vulcan. Fascinating. Given the Newtonian laws of physics governs the planet's motions, then Vulcan would be the correct answer. Live long and prosper. ps - assume each orbit is circular and divide the circumference by the # of days in a 'year' (for that planet) and those answers will give the fastest planet. probably mercury.

Venus is the youngest planet.According to Immanuel Velikovsky Venus was ejected as a comet from Jupiter and settled into its present orbit only about 4000 years ago.The Earth is the oldest planet.According to Genesis it was formed first.I can hear the professional astronomers laughing at this answer.Go ahead and chortle.It doesn't bother me.

That is a really interesting question to which I don't have an answer. The earth is around 4.6 billion years old and the sun is around 5 billion years old so say cosmologists. And the planets started to develop when the sun did so I would say that they can't be much older than earth.

One theory I've heard suggests that Mercury is the oldest planet. According to it, the planets start out as gas giants and then get compressed as they spiral closer and closer to the sun. Over time, they lose their atmospheres and fall into the sun.

Theo is right about all the planets being about the same age. He's wrong about why.

The planets formed more or less simultaneously from an accretion disk around the young sun.

there is at least some belief that Jupiter would have formed first.

no one really knows why, but one gas giant likely sparks off the rest.

they can't be gas giants because logically it did take a while for all that gas to get 30 AU away!!!!!!! so the terrestrial should be the youngest.

Apparently they all formed at about the same time