Maharashtra State Board Class 6 Science Chapter 16 The Universe

Maharashtra State Board Class 6 Science Chapter 16 The Universe

Additional Question Answers from the Chapter

Fill in the blanks:

1. The term ………… refers to the grouping of many stars and their planetary systems. [galaxy]
2. Our solar system is located within the ……galaxy. [Milky Way]
3. The galaxy that is closest to our Milky Way is called………[ Andromeda]
4. NASA launched the ………..Telescope into orbit around the earth in 1990. [Hubble ]
5. A star’s surface temperature can range from ………[3500°C to 50000°C]
6. The colour of stars changes according to their ………[temperature]
7. Sun’s diameter is approximately ………kilometers.[ 13,92,000]
8. The ………is a celestial body that revolves around the sun.[ comet]
9. A ………is composed of frozen matter and dust particles.[ comet]
10. Halley’s comet takes ………. years to complete its revolution around the sun.[76]
11. lake in Maharashtra has been formed by the impact of such a meteorite.[ Lonar]
12. ………….are celestial bodies that orbit around a planet without revolving around the sun.[ Satellites]
13. The term planet refers to a small celestial body that revolves independently around the sun.[ dwarf]
14. The full revolution of Pluto around the sun takes ………. years, while one rotation takes ……….. days. [248  , 6.38]

 

Answer the following questions:

 

Que – Why do we see only one side of the moon?

We see only one side of the moon because the moon rotates on its axis at the same rate that it orbits around the Earth, which is called synchronous rotation. This means that the same side of the moon always faces the Earth.

Que – Which planet has a day longer than its year?

Venus has a day longer than its year. Venus takes about 243 Earth days to rotate once on its axis, but it takes about 225 Earth days to complete one orbit around the Sun.

Que – Which celestial bodies form the solar system ?

The solar system is composed of the Sun and all the celestial bodies that orbit around it. This includes the eight planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune), their respective moons, dwarf planets such as Pluto and Ceres, numerous asteroids, comets, and other small bodies.

Que – What is the difference between stars and planets ?

Stars are massive, luminous balls of gas that generate heat and light through nuclear fusion, while planets are smaller, non-luminous celestial bodies that orbit stars and are not massive enough to trigger nuclear fusion.

 

Que – How many planets are there in our solar system ?

There are eight planets in our solar system. In order of distance from the sun, they are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. However, in 2006, the International Astronomical Union (IAU) redefined the definition of a planet, and Pluto, previously considered the ninth planet, was reclassified as a “dwarf planet.”

Text Book Exercises

Name these –

Birth place of stars – Nebulae

Biggest planet in the solar system – Jupiter

The galaxy which is our neighbour. – Andromeda

Brightest planet in the solar system – Venus

Planet with largest number of satellites – Jupiter

Planets without a single satellite – Venus and Mercury

Planet with a rotation different from other planets. – Venus

A celestial body that carries a tail along. – Comet

 

Fill in the blanks.

 

1. The group of galaxies of which our Milky Way is a part is called …………. .Local Group
2. Comets are made of …………. . ice and dust particles
3. The planet …………. appears as if it is rolling along its orbit. Uranus
4. …………. is a stormy planet. Jupiter
5. The Pole Star is the best example of a …………. type of star. variable

 

Say if the statements given below are right or wrong. Rewrite the statements after correcting them.

1.  Venus is the planet closest to the sun. False [Mercury is closest]
2. Mercury is called a stormy planet. False [Jupiter is a stormy planet]
3. Jupiter is the biggest planet. True

 

Answer the following.

 

Que – What is a special characteristic of the planet Mars ?

The highest and longest mountain in the solar system ‘Olympus Mons’ is located on Mars.

 

Que – What are the types of galaxies ?

Various types of galaxies are classified according to their shapes, such as spiral galaxies, elliptical galaxies, barred spiral galaxies, and irregular galaxies