The Earth is the third planet from the Sun and the only place that’s inhabited by living things,The solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune, dwarf planets such as Pluto, dozens of moons and millions of asteroids, comets and meteoroids.The Earth in the Solar System Class 6 Notes Geography Chapter 1

The Earth is the third planet from the Sun and the only place that’s inhabited by living things. It is the fifth-largest planet in the solar system, and it is the only world with liquid water on the surface. Among all the four planets closest to the Sun, the Earth is the biggest planet.

The Earth in the Solar System Class 6 Notes Geography Chapter 1

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The sun, nine planets, satellites, asteroids and meteoroids form the solar system.

The Sun

• The sun is in the center of the solar system.
• It is made up of extremely hot gases.
• The sun is about 150 million km away from the earth.

Planets

• There are nine planets in our solar system.
• The nine planets are Mercury, Venus, Earth, Mars, Jupiter, Uranus, Neptune and Pluto.
• Planets move around the sun in a fixed orbit.
• Mercury is the nearest planet.
• Pluto is the farthest planet.
• A new planet 2003 UB313 has been discovered. It is bigger than Pluto and is farthest from the sun.

Earth

• It is the third nearest planet to the sun and fifth largest planet of our solar system.
• The earth is a unique planet because it supports life.
• It is also called the blue planet.
• Its shape is Geoid.

The Moon

• It is the only satellite of the earth.
• Its diameter is one-quarter of the earth. ‘
• It is about 3.84,400 km away from us.
• It moves around the earth in about 27 days.
• Only one side of the moon is visible to us on the earth.
• No life exists on moon as it has neither water nor air.

Asteroids

• They are numerous tiny bodies which move around the sun between the orbits of Mars and Jupiter.
• The largest asteroid is the Ceres.

Meteoroids

• The small pieces of rocks which move around the sun are called meteoroids.
• Our solar system is a part of the Milky Way galaxy.
• Milky Way galaxy was named Akash Ganga.
• There are millions of galaxies that make the Universe.

The Stars and the MOON are celestial bodies which are visible only at night in the sky. During daytime, the power of the sun’s light renders them invisible.

The moon appears differently on different nights—like the Full Moon only once a month, on the poornima night whereas on the fifteenth night after that, there is no moon in the sky (amavasya).

The Pole Star is known to retain the same position every night in the sky. It is also called the North Star since it helps in knowing the North direction.

The sun is made of extremely hot gases, and it provides heat and light to the rest of the solar system. It is about 150 million kilometres away from the earth.

All the planets of the solar system are listed below: (in the order of their distance from sun)

• Mercury (planet nearest to the Sun)
• Venus
• Earth
• Mars
• Jupiter
• Saturn
• Uranus
• Neptune

Celestial Body: An object in the universe (but not on the earth) is said to be a celestial body. Examples are sun, earth, moon, stars, etc.

Star: A celestial body that is characterized by being very hot and big, and made of gases is a star. A star typically has its own heat and light.

Full Moon Night: A night when the moon is visible from the earth as a full sphere is called the Full Moon night, and it occurs once a month.

New Moon Night: The fifteenth night after the Full Moon night, when the moon is not visible at all in the sky, is called the New Moon night.

Constellation: A group of several stars which can usually be recognized by a definite pattern is called a constellation. An example is Ursa Major.

Planets: A celestial body which revolves around a particular star in an orbit, and gets all its light from that star, is called a planet. Earth is a planet.

Satellites: A celestial body which revolves around a planet in a particular orbit is called a satellite. The moon is a satellite of the Earth.

Orbit: The particular and definite elliptical path in which a planet (or satellite) always remains, is called the orbit of that planet (or satellite).

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