Tag: Solar System

Categories
APPSC/TSPSC

APPSC/TSPSC – Earth, Solar System , Planets -Important Points

 

 

Earth, Solar System , Planets –Important Points

 

The Sun is 330,330 times larger than the earth.

The order of the planets, starting closest to the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.

There are 1040 islands around Britain, one of which is the smallest island in the world: Bishop’s Rock.

The crawler, the machine that takes the Space Shuttle to the launching pad moves at 3km/h (2 mph).
The Sahara desert expands at about 1km per month.

Earth is not round; it is slightly pear-shaped.

The North Pole radius is 44mm longer than the South Pole radius.

The ozone layer averages about 3 millimeters (1/8 inch) thick.

More than 70% of earth’s dryland is affected by desertification.

The largest iceberg ever recorded was 335km (208 miles) long and 97km (60 miles) wide.

Oceanography, the study of oceans, is a mixture of biology, physics, geology and chemistry.

Winds that blow toward the equator curve west.

The US has one of the highest fire death rates in the industrialized world, with more than 2 million fires reported each year.

Luke Howard used Latin words to categorize clouds in 1803.

The tallest waterfalls in the world are Angel Falls in Venezuela. At 979 m (3,212 ft), they are 19 times taller than the Niagara Falls, or 3 times taller than the Empire State Building.

Planets, meaning wanderers, are named after Roman deities: Mercury, messenger of the gods; Venus, the god of love and beauty; Mars, the god of war; Jupiter, king of the gods; and Saturn, father of Jupiter and god of agriculture; Neptune, god of the sea.

Organist William Herschel discovered the planet Uranus in 1781 with the first reflecting telescope that he built. He named it Georgium Sidium in honour of King George III of England but in 1850 it was renamed Uranus in accordance with the tradition of naming planets for Roman gods.

During a total solar eclipse the temperature can drop by 6 degrees Celsius (about 20 degrees Fahrenheit).

Categories
Physics

Physics – Stars and the Solar System -Important Points

 

 

Physics

Stars and the Solar System
1-Sundial -A Clock based on shadows of an object due to Sunlight .

2-Celestial Bodies -The heavenly bodies are known as celestial bodies.

3-Local noon -The time when the shortest shadow occurs is called the local noon time at that place.

4-Dakshinayanam – When the Sun looks like travelling towards south of the sky, it is called Dakshinayanam.

5-Uttarayanam -When the Sun looks like travelling towards north of the sky , it is called Uttarayanam

6-Artificial satellites -The man made satellites which revolving around the planets are called Artificial satellites

7-Asteroids -There is large gap in between the orbits of Mars and Jupiters.This gap is occupied by large number of small objects that revolve around the Sun.These are called Asteroids.

8-Comets-Comets are also members of our Solar system.They revolve around the Sun in elliptical orbit.

9-Meteors- Meteors are known as shooting stars.A meteor is usually a small object that occasionally enters the earth surface.

10-Meteorite -The body that reaches the earth is called a meteorite.Meteorites help scientists in investigating the nature of material from which solar system was formed.

11-Planets – The Planets look like stars but they do not have light of their own.

12-Satellites-Any celestial body revolving around another celestial body is called its satellite.

13-Pole Star -Stars do not remain in the same spot in the sky but revolve around the pole star.The Pole star however remains fixed at one place.

14-Galaxy-A galaxy is an extremely large group of stars and planets that extends over many billions of light years.

15-Constellation -A constellation is a group of stars which form a pattern and have a name.

16-Phases of the moon-The sunrays fall on the moon illuminate half of its surface in all the position.However, we can not see the entire illuminated surface from the earth in all the position.So we can see phases of moon.

17-On the new moon day,sun and moon are on the same side of the earth.

18-On the full moon day,sun and moon are on either sides of the earth.

19-The length of the tail of the comet grows in size as it approaches the Sun.

20-Artificial satellites are revolving at a height of 38,000 km from the surface of the earth and 44,300 km from the centre of the earth.

21-The time period of the artificial satellite in stationary orbit is 24 hours.

22-Aryabhatta was the first Indian artificial satellite.

23-Every planet revolve round the sun in an elliptical orbits.

24-The astronomical distances are measured by using a unit light year.

25-The distance travelled by the light in one year is called light year.

25-The highest unit for astronomical distances measured is par-sec.( par-sec = 3.26 light years)

Categories
Geography

Geography -Solar System -Important Points For Exam

geography

 

Geography

 

 

SOLAR SYSTEM

 

 

1-Our solar system consists of the sun (the star), planets, satellites, millions of smaller bodies like asteroids, meteorites and comets and huge quantity of dust-grains and gases.

2-Out of the nine planets, Mercury, Venus, Earth and Mars are called as the inner planets as they lie between the sun and the belt of asteroids the other five planets are called the outer planets.

3-The first four planets are called Terrestrial, meaning earth-like as they are made up of rock and metals, and have relatively high densities.

4- The remaining five planets are called Jovian or Gas Giant planets.(Jupiter, Saturn, Uranus, Neptune, and Pluto-dwarf planet)

5-The orbits of the planets are nearly circular, but many comets, asteroids, and Kuiper belt objects follow highly elliptical orbits

6-Nicolaus Copernicus was the first to develop a mathematically predictive heliocentric system (Sun at the center). [Geocentric- Earth at the center]

 

 
Solar System and its Components-

 

 

1- Sun

2- Eight major planets

3- Dwarf planets (Pluto, Ceres, Eris etc.)

4- Satellites and countless minor planets

5- Asteroids

6- Meteors

7- Comets

8- Debris etc…

 

 
* A celestial body moving in an elliptical orbit round a star, the Earth is known as PLANET

* Mercury is similar to the Moon with a surface dominated by craters and a younger area of dark plains presumably made from floods of lava

* Venus is often considered to be the Earth’s twin, but the two planets are not identical.

*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.

* Mars has two tiny natural satellites (Deimos and Phobos) thought to be captured asteroids.

* Its(Mars) red colour comes from iron oxide (rust) in its soil.

* Millions of objects, remnants of planetary formation, circle the Sun in a zone lying between Mars and Jupiter. They are known as asteroids.

* Asteroids are small Solar System bodies composed mainly of refractory rocky and metallic minerals, with some ice.

* Asteroids range in size from hundreds of kilometres across to microscopic.

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