The gas giants.
4 planets
All the inner planets are terrestrial planets.
The Muslim Empire group charted the stars and planets.
I think you mean extrasolar planets. Technically, all planets except Earth are "extraterrestrial." At last report there were almost 900 of them, with more to follow. They aren't a "group" in the usual sense, just a category.
Starting with the planet closest to the sun: Mercury, Venus, Earth and Mars are called the Inner Planets.
The gas giants.
4 planets
All the inner planets are terrestrial planets.
If you mean that the 'first' 4 planets (mercury, venus, earth and mars) are a group then this group is called the ROCKY planets. Using the same grouping the next 4 planets (jupiter, saturn, uranus and neptune) are called the GAS GIANT planets. see the link I will place below
Mercury, Venus, Earth and Mars.
The Muslim Empire group charted the stars and planets.
Venus is a planet in the Solar system group of planets. Within the Solar system, Venus is grouped with the Inner planets, also called the rocky or terrestrial planets.
The four inner, or rocky planets, sometimes known as the terrestrial planets. These are closer to the sun and are hotter.
I think you mean extrasolar planets. Technically, all planets except Earth are "extraterrestrial." At last report there were almost 900 of them, with more to follow. They aren't a "group" in the usual sense, just a category.
inner planets
TerrestrialMercuryVenusEarthMarsGas GiantsJupiterSaturnIce GiantsUranusNeptune