Lightweight planets are defined as planets that have a mass less than 0.1% that of Earth. This means that they can range in mass from just a few times the mass of the Moon to several times the mass of Jupiter.

One of the most famous lightweight planets is Mars. This rocky planet has a mass of just 0.1 times that of Earth and has been the subject of numerous space missions.

Another type of lightweight planet is the gas giant. These planets, like Jupiter and Saturn, have masses that are much larger than Earth but are still considered lightweight compared to other gas giants.

The tallest tree in the world is a coast redwood named Hyperion, which stands at 379.7 feet (115.7 meters) tall. This tree is located in California, USA, and was discovered in 2006.

The largest tree in the world is a giant sequoia named General Sherman, which has a volume of 52,508 cubic feet (1,487 cubic meters). This tree is located in California, USA, and is estimated to be around 2,200 years old.

Some giant trees have been known to live for over 3,000 years. The oldest known tree is a bristlecone pine named Methuselah, which is estimated to be around 4,850 years old.

Trees are an essential part of our planet's ecosystem. They provide us with oxygen, absorb carbon dioxide, and help to regulate the climate. Trees also provide us with food, medicine, and materials for shelter and clothing.

One of the most important functions of trees is the production of oxygen. Trees absorb carbon dioxide from the atmosphere during photosynthesis and convert it into oxygen. This process helps to purify the air and make it safe for us to breathe. In fact, one mature tree can produce enough oxygen to support two people for an entire year.