The planets that were formed by light gases are called terrestrial planets, also known as the gas giants.
The gas giants are:
The sun burn gases and is static, where as the moon and the other planets move and are not sources of light.
I think the question is probably about "light elements".The inner planets are relatively warm and small. This means they have notbeen able to keep the lightest elements, hydrogen and helium, as gases.
Simply because the gas giants are so big that the force of gravity is sufficient to retain the light gases.
All the sun's planets probably had similar atmospheres when they first formed, billions of years ago. The most common gases were the light gases, hydrogen and helium, with smaller amounts of oxygen, nitrogen and other gases. The immense gravity of the giant planets, Jupiter, Saturn, Uranus and Neptune, was able to hold the hydrogen and helium, which remain the predominant gases in their atmospheres, along with methane formed by the combination of hydrogen with free carbon. However, hydrogen and helium gradually escaped from the atmospheres of the smaller planets, where gravity is insufficient to hold the light gases permanently. Even the heavier gases, such as oxygen and nitrogen, as well as carbon dioxide and water vapour, can gradually escape from smaller planets, such as Mars and Mercury. So, these planets now have quite thin atmospheres. The Moon and other small bodies in the solar system have essentially no atmosphere. In our solar system, only the Earth and Venus are the right size to lose most of the light gases, while retaining gases such as oxygen, nitrogen, carbon dioxide and water vapour.
no planets crust does not have light of their own but the core of the earth has light of its own
Uranus
no.
Uranus was formed from the light gases of the outer solar nebula.
The sun burn gases and is static, where as the moon and the other planets move and are not sources of light.
Uranus
Saturn
I think the question is probably about "light elements".The inner planets are relatively warm and small. This means they have notbeen able to keep the lightest elements, hydrogen and helium, as gases.
Simply because the gas giants are so big that the force of gravity is sufficient to retain the light gases.
Planets reflect light.
In order for gas to leave a planet it needs to be hot enough and to overcome the planet's gravity. The outer planets are colder and are very massive in comparison to Earth.
All the sun's planets probably had similar atmospheres when they first formed, billions of years ago. The most common gases were the light gases, hydrogen and helium, with smaller amounts of oxygen, nitrogen and other gases. The immense gravity of the giant planets, Jupiter, Saturn, Uranus and Neptune, was able to hold the hydrogen and helium, which remain the predominant gases in their atmospheres, along with methane formed by the combination of hydrogen with free carbon. However, hydrogen and helium gradually escaped from the atmospheres of the smaller planets, where gravity is insufficient to hold the light gases permanently. Even the heavier gases, such as oxygen and nitrogen, as well as carbon dioxide and water vapour, can gradually escape from smaller planets, such as Mars and Mercury. So, these planets now have quite thin atmospheres. The Moon and other small bodies in the solar system have essentially no atmosphere. In our solar system, only the Earth and Venus are the right size to lose most of the light gases, while retaining gases such as oxygen, nitrogen, carbon dioxide and water vapour.
No, planets don't give off light, stars did.