Dwarf Planets Facts…….

Posted By: Shreyasi Bhattacharya
Class: VIII B

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Planet Quiz…..

1. Now that Pluto is no longer included, how many planets are there in the Solar System?
2. What is the smallest planet in the Solar System?
3. What is the largest planet in the Solar System?
4. What is the hottest planet in the Solar System?
5. The sixth planet from the Sun features an extensive ring system, what is the name of this planet?
6. The chemical element uranium was named after what planet?
7. What planet in the solar system is farthest from the Sun?
8. What is the second smallest planet in the solar system?
9. What planet is closest in size to Earth?
10. The moon Titan orbits what planet?
11. What planet is nicknamed the ‘Red Planet’?
12. True or false? Neptune is larger than Saturn.
13. The Galilean moons orbit what planet?
14. What planet is closest to the Sun?
15. What is the seventh planet from the Sun?
16. True or false? Venus has more atmospheric pressure than Earth?
17. Triton is the largest moon of what planet?
18. What is the brightest planet in the night sky?
19. What is the third planet from the Sun?
20. Phobos and Deimos are moons of what planet?

Planet Quiz Answers

1. 8
2. Mercury
3. Jupiter
4. Venus
5. Saturn
6. Uranus
7. Neptune
8. Mars
9. Venus
10. Saturn
11. Mars
12. False
13. Jupiter
14. Mercury
15. Uranus
16. True
17. Neptune
18. Venus
19. Earth
20. Mars

Posted By: Shreyasi Bhattacharya

Class: VIII B

Amazing Facts on Comets………

A comet is a relatively small solar system body that orbits the Sun. When close enough to the Sun they display a visible coma (a fuzzy outline or atmosphere due to solar radiation) and sometimes a tail.

The coma is created as the comet gets closer to the Sun, causing water, carbon dioxide and other compounds to sublime (quickly changing from solid to gas) from its surface.

Comets are made of ice, dust and small rocky particles.

The name comet comes from the Greek word meaning ‘hair of the head’, it came from the Greek philosopher Aristotle who observed comets as ‘stars with hair’.

Short term comets (also known as periodic comets) have orbital periods of less than 200 years while long term comets have orbital periods of over 200 years.

Halley’s Comet

Halley’s Comet (or Comet Halley as it is also known) is the most well known comet.

It is known as a periodic comet (or short term comet) because the time it takes to orbit the Sun is less than 200 years.

Records of humans observing Halley’s Comet go back thousands of years, with appearances noted by Babylonian, Chinese and European star gazers.

It can be seen with the naked eye from Earth every 75 to 76 years (although the time period has between 74 and 79 years in the past).

It last appeared in the inner Solar System in 1986 and will return again sometime in 2061 (start charging your camera battery).

Halley’s Comet is named after English astronomer Edmond Halley who first determined its period of orbit. It was the first comet to be recognized as having a periodic orbit.

Halley’s Comet appearance in 1986 allowed researchers to investigate its make up more closely using spacecraft. While some previous theories were proven correct, other models were altered with the new information. For example, while earlier models predicted the comet to feature many volatile ices, the actual amount was less than first expected.

The tail and fuzzy glow you see around Halley’s Comet is known as a coma. It occurs when the comet gets close to the Sun and compounds such as frozen water and carbon dioxide sublime (rapidly change from solid to gas) from its surface.

While the coma over Halley’s Comet can stretch up to 100,000 km across, the nucleus is actually small, only around 15km (9.3 miles) long, 8km (5 miles) wide and 8km (5 miles) thick.

Comet Shoemaker-Levy 9

In July 1994, the Shoemaker-Levy 9 comet broke apart and collided with Jupiter. This event gave astronomers a unique opportunity to observe what happens when such a collision occurs.

The largest fragments were 2 km (1.2 mi) in diameter and struck Jupiter at a speed of around 60 km/s (37 mi/s). The impact scars were clearly visible for months after the impact.

Shoemaker-Levy 9 was originally located by astronomers Eugene M. and Carolyn Shoemaker and David Levy in March 1993.

Posted By: Shreyasi Bhattacharya

Class: VIII B

STORY OF THE UNIVERSE……..

Most astronomers believe the Universe began in a Big Bang about 14 billion years ago. At that time, the entire Universe was inside a bubble that was thousands of times smaller than a pinhead. It was hotter and denser than anything we can imagine.

Then it suddenly exploded. The Universe that we know was born. Time, space and matter all began with the Big Bang. In a fraction of a second, the Universe grew from smaller than a single atom to bigger than a galaxy. And it kept on growing at a fantastic rate. It is still expanding today.

As the Universe expanded and cooled, energy changed into particles of matter and antimatter. These two opposite types of particles largely destroyed each other. But some matter survived. More stable particles called protons and neutrons started to form when the Universe was one second old.

Over the next three minutes, the temperature dropped below 1 billion degrees Celsius. It was now cool enough for the protons and neutrons to come together, forming hydrogen and helium nuclei.

After 300 000 years, the Universe had cooled to about 3000 degrees. Atomic nuclei could finally capture electrons to form atoms. The Universe filled with clouds of hydrogen and helium gas.

 

Posted By: Shreyasi Bhattacharya

Class: VIII B

All the Thirteen Planets of our Solar System…………

Posted By: Shreyasi Bhattacharya
Class: VIII B

The Biggest Star in the Universe!!!!!!!!

Have a look at the Biggest Star in the Universe……….

Posted By: Shreyasi Bhattacharya
Class: VIII B

The Moon

Posted By: Shreyasi Bhattacharya
Class: VII B