4. SUN
The Sun is the star that
Earth and all of the
Solar System have as
their center that they
orbit. It is a massive,
hot ball of plasma,
inflated and heated by
nuclear fusion
reactions at its core.
5. SUN
MERCURY
Mercury is the first planet from
the Sun and the smallest in the
Solar System. It is a terrestrial
planet with a heavily cratered
surface due to overlapping
impact events. These features
are well preserved since the
planet has no geological
activity and an extremely
tenuous atmosphere called an
exosphere.
6. SUN
MERCURY
VENUS
Venus is the second planet
from the Sun. It is a rocky
planet with the densest
atmosphere of all the rocky
bodies in the Solar System,
and the only one with a mass
and size that is close to that
of its orbital neighbor Earth.
7. SUN
MERCURY
VENUS
EARTH
Earth is the third planet from
the Sun and the only
astronomical object known to
harbor life. This is enabled by
Earth being a water world,
the only one in the Solar
System sustaining liquid
surface water. Almost all of
Earth's water is contained in
its global ocean, covering
70.8% of Earth's surface.
8. SUN
MERCURY
VENUS
EARTH
MARS
Mars is the fourth planet and
the furthest terrestrial planet
from the Sun. The reddish
color of its surface is due to
finely grained iron(III) oxide
dust in the soil, giving it the
nickname "the Red Planet".
Mars's radius is second
smallest among the planets in
the Solar System at 3,389.5
km.
9. MERCURY
VENUS
EARTH
MARS
JUPITER
Jupiter is the fifth planet
from the Sun and the
largest in the Solar System.
It is a gas giant with a mass
more than two and a half
times that of all the other
planets in the Solar System
combined, and slightly less
than one one-thousandth
the mass of the Sun.
10. VENUS
EARTH
MARS
JUPITER
SATURN
Saturn is the sixth planet
from the Sun and the
second-largest in the Solar
System, after Jupiter. It is a
gas giant with an average
radius of about nine-and-a-
half times that of Earth. It
has only one-eighth the
average density of Earth,
but is over 95 times more
massive.
11. EARTH
MARS
JUPITER
SATURN
URANUS
Uranus is the seventh
planet from the Sun and is
a gaseous cyan ice giant.
Most of the planet is made
of water, ammonia, and
methane in a supercritical
phase of matter, which in
astronomy is called 'ice' or
volatiles.
12. MARS
JUPITER
SATURN
URANUS
NEPTUNE
Neptune is the eighth planet
from the Sun and the farthest
IAU-recognized planet in the
Solar System. It is the fourth-
largest planet in the Solar
System by diameter, the third-
most-massive planet, and the
densest giant planet. It is 17
times the mass of Earth, and
slightly more massive than its
near-twin Uranus.