Uranus
The planet most commonly known as an extrasolar planet that least resembles those in our solar system is HD 189733b. This exoplanet is a gas giant with extreme weather conditions, including high-speed winds reaching up to 5,400 miles per hour and temperatures around 1,200 degrees Celsius. Its blue color, caused by silicate particles in its atmosphere, sets it apart from the more familiar terrestrial planets like Earth and Mars. These extreme characteristics highlight the diversity of planetary systems beyond our own.
This question is impossible to answer. As of today, 11th April 2011, there are over 540 known extrasolar planets - each one is different in it's own unique way. The only answer, based on today's knowledge, is that none - so far - are like the inner planets but that is due to our technology rather than the actual planets.
Mars is the least dense of the rocky planets.
Earth has just one moon. All the other planets except Mercury and Venus have moons.
neptune and Pluto are the two planets (altho Pluto is not officially a planet any more) that we know the least about because they are the ferrets away in the solar system and there for get the least amount of attention. but apart from mars and venus we do not know that much more about the other planets.
They least resemble rocky planets like Venus Earth and Mars, particularly they least resemble planets that we would consider as possible life sustaining planets.
We tend to see the large planets farthest away from their stars. So it is unlikely we will find any small planets close to their star similar to Mercury.
Most known extrasolar planets least resemble Earth, both in terms of size and distance from their parent stars. Gas giants, hot Jupiters, and super-Earths are more common than small, rocky planets like Earth among the exoplanets discovered so far.
Most known extrasolar planets least resemble Earth due to their extreme characteristics such as being extremely close to their parent star, having very short orbital periods, or being much larger than Jupiter. These differences make them fundamentally different from Earth in terms of habitability and physical properties.
Mars The inner planets such as Mars, Earth or Mercury. these are too small to identify in other systems and too close to the star.
Mercury is the smallest planet in the Solar System
Mercury is the least massive of all the planets. The least massive planet is Mercury (0.055 Earths). However, the planet with the weakest gravity is Mars. I am of course not treating Pluto as a Planet (as it is no longer categorized as a planet), if I were to count Pluto then it would be the least massive ( 0.0021 Earths).
Saturn is the least dense planet in our solar system.
This question is impossible to answer. As of today, 11th April 2011, there are over 540 known extrasolar planets - each one is different in it's own unique way. The only answer, based on today's knowledge, is that none - so far - are like the inner planets but that is due to our technology rather than the actual planets.
Jupiter
All of them are - at least, the planets in the Solar System.
earthAll eight planets have at least one moon, except for Venus and Mercury. Some planets have many moons, over 60 for Jupiter and Saturn.