Stars And Our Solar System

Rotation is when a planet spins on its axis. The axis is an Fixed imaginary line passing from center of planet. For e.g. Earth completes one complete rotation in 24 hours.

The Rotation of a planet has been shown in the figure

All planets spins on its axis called rotation of planets, Venus also spins on its axis but it spins in opposite direction from other planets all planets rotates west to east direction and it rotates in east to west direction .it also rotates at slowest rate compared to other planets as it takes 243 days to complete on rotation.

The soil on mars is rich in iron so it is red in color, which makes the planet appear red when viewed from space, that is why mars is also called red planet.

Reason:

Moon Rotates or spins on its own axis and at the same time moon revolves around Earth in a fixed orbit (path) and time taken by moon to complete on revolution around earth is nearly equal to time taken by moon to complete on rotation that is 27.3 Days so every time same face of moon appears to an observer on earth viewing moon because in completing one circle it completed one rotation also so at the end of 27.3 days it appears at same place from where it started and facing towards the earth in the same way as of earlier

The simultaneous rotation and revolution of moon around earth has been shown in the figure

Reason: All planets revolves around sun in a fixed path called as orbit, orbits of planets are separated by vast distance from each other and do not cross each other so planets do not so they do not collide into one another.

Reason: Saturn has some unique characteristic like :-

1. Saturn has rings around it, these rings are made up of rocks, ice and dust.

2. Density of Saturn is less than that of water (density is mass per unit volume), i.e. it is very light so if there were large enough ocean Saturn would float on it.

Reason:

We see the planets and stars like our own sun moving from east to west because our earth rotates from west to east so, we find the other planetary objects to move in the opposite direction. Planets and stars appear moving from east to west. This is because of the rotation of the earth from west to east.

Reason: We can watch India--England cricket match is played at Lords we can watch it live at home due to artificial satellites because revolve around earth in space and are used for communication they receive signal(Video and Audio of the match being recorded on camera) from lords and then transmit it or telecast it to our homes through Dth and we can watch it on TV.

(a) 88,51

there are total 88 constellations out of which 51 belongs southern hemisphere sky , constellations are group of stars that make an imaginary shape in the night sky, Example scorpius.

(b) 63

Jupiter has 63 moons, moon is a natural satellite which revolves around a planet in a fixed orbit (path).

(c) Aryabhatta

Aryabhatta was India's first artificial satellite, artificial satellite is a man made device that revolves around planet in a fixed orbit(path).

(d) Satellite

Satellite revolves above surface of earth and capture images, and other data regarding weather conditions like cloud formation at a certain place or variation in air pressure etc. and transmit this data to scientists on earth , on the basis of which they predict the weather.

(a) Morning star -3 Venus

Venus is seen just before sunrise during the time when planet is west of sun, that is why is called as morning star.

(b) The Great Bear -4 Constellation

Constellations are group of stars that make an imaginary shape in the night sky

(c) IRS -5 Artificial satellite

Artificial satellite is a man made device that revolves around planet in a fixed orbit(path).

(d) Asteroids -2 Between Mars and Jupiter

Asteroid is small rocky body revolving around sun in fixed orbit(path). Large no. of these Asteroids are found between the orbits of mars and Jupiter.

(e) Halley's comet -6 76 years

Halley's comet is probably the most well known of all the comets. It approaches the sun every 75-76 years.

(f) Rotation of the moon -1-27.3 days

Moon takes approximately 27 days to rotate once on its axis

(The axis is an Fixed imaginary line passing from center of moon or planet)

The name of the Indian astronauts are given as:

i. Rakesh Sharma

ii. Kalpana Chawla:

iii. Sunita Williams:

iv. Ravish Malhotra:

The student should it by themselves.