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Different planets of Solar System are
| Name of Planet | Description | Number of Moons |
|
Mercury
|
It is nearest planet to sun |
0 |
| It is the smallest planet of solar system | ||
| It is visible just near horizon during sunrise or sunset | ||
|
Venus
|
It is nearest to earth |
0 |
| It is brightest in sky | ||
|
Sometimes Venus appears in the eastern sky before sunrise. Sometimes it appears in the western sky just after
sunset. |
||
| So, it is called morning star or evening star | ||
|
Earth
|
It is neither too close too sun nor too far(so it is neither too hot nor too cold) |
1 |
| It has its own atmosphere and presence of water | ||
|
Mars
|
It is slightly reddish in color so it is called red planet |
2 |
|
Jupiter
|
It is largest planet |
79(4 visible by small telescope |
| Size of Jupiter is 1300 times of that of earth | ||
| Mass is 318 time that of earth | ||
| It has faint rings around it | ||
|
Saturn
|
It is yellow in color |
Many (62) |
|
It has number of rings around it which cannot be visible with the naked eyes but can be seen with a telescope
It also has large number of satellites. |
||
| It is the least dense planet(density is less than water) | ||
|
Uranus
|
It rotates from east to west |
Many (27) |
|
It has a highly tilted rotation axis,it appears to roll on its side.
Uranus can be seen with the help of a large telescope |
||
|
Neptune
|
It is the outermost planet |
Many (14) |
| Neptune can be seen only with help of large telescope |
Note: The planets do not have light of their own. They reflect the light of the Sun that falls on them.
Name the inner planets of the solar system
Planets which are close to the sun are known as the inner planet
They are Mercury,Venus,Earth,Mars
Inner planets have very few moons
Name the outer planets of the solar system
Planets which are far away from sun are known as the outer planets
They are Jupiter,Saturn,Uranus,Neptune
Outer planets have large number of moons
How does Earth appears from Moon
Earth appears to be of blue-green color because of the reflection of water and land on its surface
What causes change of season on Earth
It is due to rotational axis of earth which is tilted
Part of earth which is nearer to sun has summers
Part of earth which is far from sun have winters
Example
In Northern Hemisphere(India,England) we have summers in May-june and winters in Dec-Jan
In Southern Hemisphere (Australia,New Zealand) there are winters in may-June and summers in Dec -Jan
Difference between Rotation and Revolution
Rotation
Movement of planet around its axis is called Rotation
Example
Earth takes one day to rotate around sun
Revolution
Movement of one object around another object is called revolution
Example
Earth takes One Year to Complete One Revolution around the sun
What is Period of Rotation and Period of Revolution
| Period of Rotation | Period of Revolution |
| Time taken by a planet to complete one rotation is known as the period of Rotation | Time taken by a planet to complete one revolution is known as a period of Revolution |
| Earth takes 24 hours to spin once around its axis. Its period of rotation is 24 hours or a day. |
Earth takes 365 days to complete one revolution around the sun. The period of revolution of earth around the sun is 365 days.
|
What is an Orbit?
Path which a planet takes to revolve around sun is called orbit
Example
Earth has a definite path,it always take same path while revolving around sun
This path is called orbit
Questions
NCERT Question 2 - Which of the following is NOT a planet of the sun?
(a) Sirius
(b) Mercury
(c) Saturn
(d) Earth
NCERT Question 4 (a) - The planet which is farthest from the Sun is ____________ . .
NCERT Question 4 (b) - The planet which appears reddish in colour is ____________ .
NCERT Question 5 (b) - Mark the following statements as true (T) or false (F):
Mercury is the smallest planet of the solar system. ( )
NCERT Question 5 (c) - Mark the following statements as true (T) or false (F):
Uranus is the farthest planet in the solar system. ( )
NCERT Question 5 (e) - Mark the following statements as true (T) or false (F):
There are nine planets in the solar system. ( )
NCERT Question 6 (i) - Match items in column A with one or more items in column B: A B
NCERT Question 7 - In which part of the sky can you find Venus if it is visible as an evening star?
NCERT Question 8 - Name the largest planet of the solar system.
