The universe contains everything from atoms to galaxies. There are three types of galaxies - spiral, elliptical, and irregular - which differ in their shapes. The Milky Way galaxy contains between 100-400 billion stars and is 100,000 light years across. Our solar system consists of the Sun and eight planets that orbit it, along with asteroids, comets, and other objects. The eight planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Stars are celestial objects that emit their own light, like our Sun which is the closest star to Earth. Constellations are recognizable patterns of stars in the night sky.

1. Our Earth in the Universe
By : Ishank Kaushik

2. What is the universe?
The universe is….basically, everything.
Scientifically, it’s defined as the totality of
everything that exists, including all physical
matter and energy, ranging from the smallest
atom to the biggest galaxy—the planets, stars,
everything

3. Kinds of Galaxies
Some galaxies are very small with only a few million
stars. While other could have as many as 400 billion
stars, or even more.
There are three kind of galaxies, Spiral, Elliptical, and
Irregular. The only difference between the three is
what shape they are.
Spiral Elliptical Irregular

4. A hundred to four hundred billion stars

5. 5
The Milky Way
as seen from
the Enterprise
A hundred thousand light years across
Light would take
1,00,000 years to
travel across the
galaxy.

6. What is our Solar System?
Our solar system
consist of central star (the
Sun), the eight planets
orbiting the sun, moon,
asteroids, comets, meteors,
interplanetary gas, dust,
and all the “space” in
between them.
The eight planets of the
Solar System are named of
Greek and Roman Gods
and Goddesses.

7. PLANETS
Planets are large celestial objects which revolve
around the sun in close elliptical paths are called
orbits. The eight planet of solar system are :-
a)Mercury b)Venus c)Earth d)Mars e)Jupiter
f)Saturn g)Uranus h)Neptune
Planets have no light of own. A planet is made up of
rock & metal, or gas. All the planets revolve around
the sun are also rotate on its axis.

9. STARS
• Stars are the celestial objects
that are extremely hot & have
light of their own.
• The stars appear to be small
because they are very, very far
away from us.
• The “SUN” is the star which is
nearest tot the earth. The sun
looks much bigger and brighter
because it is much nearer to us
than any other star.

10. What is Constellations?
• The group of stars which appears
to form a recognisable pattern is
known as constellations. Each
constellation has been given a
name signifying an animal, a
human being or some other object
which it appears to resemble.
• Some of the important
constellations which can see
during night sky are ursa major,
orion, cassiopeia, leo major

11. The SUN
The sun is a star. It is a star around earth & other planet
which revolve. The sun is a star having a system of
planets around it with life of one of its planets
“EARTH”. The sun is a extremely hot object having
temperature 6000 degree celsius. The sun is not a
solid object. The sun consist of mostly hydrogen gas.
The sun is the main source of heat and light energy for
all the planets of the solar system & their satellites.