Earth

A close view of Earth from space reveals a “blue-white ball” figure. When examined from afar, it appears to be what scientists call “a tiny pale dot”. The planet is set against a black background, and by taking a closer look we can see blue waters, green and brown land masses, and white clouds make up a large portion of its surface. It is also the only planet known to contain liquid water and can support life. The abundance of water is a unique factor that distinguishes it from other planets within the solar system. This planet also hosts a population of species (including humans).

Planet Earth travels at a speed of approximately 67,000 miles per hour. Fact wise, it is the third planet from the sun (after Mercury and Venus). It is located about 150 million kilometers away from the sun. Within the solar system, it is the fifth largest among the eight planets (the largest planet would be Jupiter). On the surface, the atmospheric condition is made up of 78 percent nitrogen gas, 21 percent oxygen, and 1 percent of other gases. The high oxygen content renders it suitable to sustain life. The atmosphere also serves as a barrier against harmful sun rays and shields its inhabitants from meteors (they often burn up before they can reach planet surface).

Among the 4 terrestrial or inner planets (Mercury, Venus, Earth, and Mars), this planet is the largest and densest. Age wise, this planet is about 4.54 billion years old. Its interior consists of solid iron inner core, solid mantle, and a liquid outer core. It also has a natural satellite- the Moon. Tidal interactions with the Moon stabilizes Planet Earth’s axial tilt, which keeps it stable in terms of temperature and seasonal changes over a period of millions of years.

Life can be supported within this planet due to its unique features. Its lifespan is closely related to the Sun and is expected to be able to support life for another 1.5 billion years.

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