This is only a guess but it could be that the tidal forces on a large planet close to the Sun would pull it apart. Tidal forces are caused by one side of the planet being closer to the Sun than the other side, so the force of gravity tends to pull it apart. On the Earth that force does not pull it apart but it causes the tides, and the Moon's gravity contributes also.
inner planets and gas giants
The first four are the smaller `Rocky` planets, then the last four are known as the 'gas giants'. The gas giants are further out from the sun, with Neptune being the furthest planet away from our sun (in our solar system). Pluto is further out still, but since 2006 it has been downgraded to a 'Dwarf Planet', so is no longer a `planet`. There have been a few other dwarf planets discovered that are even further out than Pluto, but of similar size, such as Makemake and Sedna.
The ice giants of our solar system are Uranus and Neptune.
Jupiter, Saturn, Uranus, and Neptune are the gas giants of our solar system.
The giant planets are Jupiter, Saturn, Uranus and Neptune.They are then further defined as:-Gas giants: Jupiter and Saturn.Ice giants: Uranus and Neptune.Older text and teachers still refer to then all collectively as gas giants, but this is not correct.
4 planets in our solar system are not solid, and are commonly referred to as the Gas Giants.
Jupiter, Saturn, Uranus, and Neptune are the gas giants of our solar system.
Four of them - the gas giants.
There are two types of planets in the solar system. These are, the smaller, rocky planets, which are Mercury, Venus, Earth, and Mars, and the gas giants, which are Jupiter, Saturn, Uranus, and Neptune.
In the solar system we have 4 rocky planets and 4 gas giants. The gas giants consist of mainly CO2 and SO2
Four planets in the solar system have rings: Jupiter, Saturn, Uranus, and Neptune. All of these planets are gas giants.
Not in our solar system. The inner planets are smaller.