» The Sun is at the center of the Solar System.» Its size is thirteen lakh times as that of the Earth.» It is the nearest star to the Earth.» It is an ultimate source of energy for life on Earth.» Its diameter is 14 lakh kms.» It is composed of 71% Hydrogen, 26.5% Helium and 2.5% other element

» These are opaque bodies which continuously revolve around and are lighted by the Sun.» There are eight planets in the Solar system.» A ninth planet has been recently discovered by NASA named as Carla.» The sequence of planets according to their distance from the Sun is Mercury, Venus, Earth, M

» The eight planets have been divided into two groups. All the planets of a particular group have some common features. 'Terrestrial planets' or 'Rocky planets' and 'Jovian planets' or 'Gaseous planets' (Gas giants) are the two groups of planets.» The four planets nearest to the Sun-Mercury, Venus

It is hypothesized that every elementary particle in the Universe has a partner particle, known as an ‘antiparticle’.

The particle and its antiparticle share many similar characteristics, but many other properties are the exact opposite.

The electron, for example, has as its antiparticle t

Dark energy is an unknown form of energy which is hypothesised to permeate (spread throughout) all of space, tending to accelerate the expansion of the universe.


What is Dark matter??

The velocity of rotation for spiral galaxies depends on the amount of mass contained in them.

But the out

 A meteoroid is any solid debris originating from asteroids, comets or other celestial object and floats through interplanetary space.

 A meteor is the streak of light that appears in the sky when a meteoroid enters the atmosphere (mesosphere) at about 200 km at high speed and burns up because of

# A comet is an icy small Solar System body that, when passing close to the Sun, heats up due to the effects of solar radiation and the solar wind upon the nucleus and begins to outgas, displaying a visible atmosphere or coma, and sometimes also a tail.

# Comets have highly elliptical orbits, unl

# Asteroids are remnants of planetary formation that circle the Sun in a zone lying between Mars and Jupiter. The circular chain of asteroids is called the asteroid belt.

# The remnants of planetary formation failed to coalesce because of the gravitational interference of Jupiter.

# The astero

# The terrestrial planets were formed in the close vicinity of the parent star where it was too warm for gases on the surface to condense to solid particles.

# The solar wind was most intense nearer the sun; so, it blew off lots of gas and dust from the surface of the terrestrial planets.

# Th

Saturn
# Saturn’s rings are probably made up of billions of particles of ice and ice-covered rocks.

# Titan is the second-largest moon in the Solar System (larger than Mercury) and it is the only satellite in the Solar System with a substantial atmosphere (nitrogen-rich).

Uranus

# In con

It is called Outer planet.
# It is composed mostly of gas and liquid swirling in complex patterns with no solid surface.

# Jupiter’s four large moons (Io, Europa, Ganymede, and Callisto), called the Galilean satellites because Galileo discovered them.

# Ganymede is the largest natural satel

# Outer Planets are Jupiter, Saturn, Uranus, Neptune and the dwarf planet – Pluto.

# The four outer planets, called the gas giants, collectively make up 99% of the mass known to orbit the Sun.

# They are composed mainly of hydrogen & helium & lack a solid surface. Their moons are, however, s

# Mars is often referred to as the “Red Planet” because of the reddish iron oxide prevalent on its surface.

# Mars has a thin atmosphere and has surface features ranging from impact craters of the Moon and the valleys, deserts, and polar ice caps of Earth.

# Mars is the site of Olympus Mon

# Its diameter is only one-quarter that of the earth.

# It is about 3,84,400 km away from us.
A ray of light from the sun takes about eight minutes to reach the earth. Light takes only a second to reach us from the moon.

# The moon is tidally locked to the earth, meaning that the moon revolve

# Venus is the brightest planet in the solar system and is the third brightest object visible from earth after the sun and the moon.

# It is the brightest among planets because it has the highest albedo due to the highly reflective sulfuric acid that covers its atmosphere. It is sometimes visible

# Mercury’s surface appears heavily cratered and is similar in appearance to the Moon’s, indicating that it has been geologically inactive for billions of years (because there is no atmosphere on Mercury).

# When viewed from Earth, the planet can only be seen near the western or eastern horiz

Inner Planets
# The inner Solar System is the traditional name for the region comprising the terrestrial planets and asteroids.

# They are composed mainly of silicates and metals.

# The four inner or terrestrial planets have dense, rocky compositions, few or no moons, and no ring systems.

Planet: 

# A celestial body moving in an elliptical orbit around a star is known as a planet.

# The planets of our solar system are divisible in two groups:

# the planets of the inner circle (as they lie between the sun and the belt of asteroids) or the inner planets or the ‘terrestrial p