1. What sort of star is the sun?
The sun has a place with a group of around 100,000 millions old stars in our System. Some are a lot more sweltering than the Sun, while others are cooler. Some are a lot bigger, and some are more modest. The Sun is an extremely common star, and there are a great many different stars like it.
2. How hot is the Sun?
The sun is the hottest and brightest at its centre, where the temperature is believed to be about 15 million degree centigrade. By the time this heat has worked its way to the surface, it has fallen and decrease to 6000 degrees about four times as hot as a steel furnace. There are many more stars that are hotter than the sun.
3. What is Sunspot?
A sunspot is a dark area on the suns brilliant surface. It appears dark because it is cooler, and so gives out less light sunspots are particularly common every 11 years or so, and this is known as the sunspot circle.
4. What is the suns corona?
The corona is often called the suns atmosphere but is not at all like our own atmosphere. It has a temperature of a million degrees centigrade and is a million times thinner than air. The brilliance of the sun hides it from view except during the total eclipse.
5. What types of Galaxy are there?
No two galaxies look exactly alike, but there are three main kinds. Some are irregular, with no particular slope, others are spiral, with trailing arms of stars and nebulae. The commonest are elliptical, like a smooth swarm of stars.
6. What is the age of the Universe?
The galaxies in the universe appear to be expanding away from each other. If we work backwards, we find that they were close together between 15,000 and 20,000 million year ago.
7. Which is the nearest galaxy to our own?
Our galaxy’s closest neighbour is the large Magel panic cloud which is about 150,000 light-years away. It is only one third the diameter of our galaxy and contains only a tenth of as many stars.
8. What causes Aurorae?
At about 200 kilometres above the earth’s surface, the air is very thin and its atoms are widely scattered. Tiny electric particles from space, known as electrons, can penetrate the air at this height. If one strikes an atom, a flash of light is given out. An aurora is a glow caused by countless millions of these flashes, produced when the sun is very active.
9. What are solar prominences?
A prominence is a fountain of glowing gas rising up from the sun’s surface. Some prominences escape into space, but most last for a few hours or days, and then fall back into the sun.
10. When did the first man fly in space?
The Soviet cosmonaut Yuri Gagarin made the first orbit of the Earth on 12 April 1961, in a Vostok spacecraft. The trip lasted 108 minutes, and he landed in a field within ten kilometres of the planned descent point.
11. When did the space shuttle make its first flight?
The first space shuttle launch took place on 12 April 1981, using the space shuttle Columbia which was only a test flight, it made 36 orbits of the earth during its 54 hours stay in space. It took off exactly 20 years after the first orbital flight by Yuri Gagarin to the space. The main problem encountered during the maiden flight was the loss of some of Columbia’s 29,000 heat resistant tiles. In January 1986 Challenger blew up shortly after takeoff, killing the crew of seven.
12. Why were the asteroids formed?
The asteroids consist of countless thousands of tiny planets left over from the solar system’s early history when the sun and the planets were being formed.
13. Why are giant planets gaseous?
The sun and the planets of the solar system were formed from a huge cloud of gas and tiny solid particles about 4600 million years ago. Most of the gas was hydrogen. Small planets such as the Earth lost a lot of hydrogen into space, but the giant planets kept all of theirs.
14. Why do comets appear unexpectedly?
Most comets take thousands or even millions of years to go around the sun, and their orbits are so elongated or eccentric’ that they travel from beyond Pluto. Very few become bright enough to see until they are as close as Mars. This is why some comets appear without warning every year. Some comets pass close to the sun every few years. The famous Halley’s Comet, which has a period of 76 years, has been observed regularly since 239 B.C. Comet. West, which was visible in daylight in 1976 will not return to the sun for about a million year.
15. Why do meteors occur?
A meteor is a streak of light high up in the atmosphere. It occurs when a tiny solid object, smaller than a marble, plunges through the air at a speed of many Kilometres per second. The body is burned up by friction, leaving a white-hot trail.
16. Why do the eclipses of the sun occur?
A solar eclipse can be seen only at New Moon when the Moon is between the earth and the sun. On average, a total eclipse is seen from the same site every 350 years.
17. Why is the setting sun red?
The world’s air resembles a light red channel and makes all the light coming from space become marginally rosy however an article which is extremely low in the sky needs to radiate through considerably more air than one high in the sky. This implies that its light infiltrate through a greater amount of this red channel and its color is more profound.
18. Why does the sun keep shining?
Even the tiniest object you’ll see with a microscope contains variant atoms. Each atom contains much tinier particles still. Inside the sun atoms are being pulled to pieces and put together again during a different way. this offers out heat and keeps the sun shining
19. How do stars twinkle?
Out in space, stars don’t twinkle. But when their light passes through the Earth’s atmosphere, it’s made to flicker by the new and cold ripples of air. you’ll see the effect by gazing an overseas view over a hot road in summer, or across a bonfire.
20. How do stars die?
A star sparkles by transforming its hydrogen into another component called helium. this modification gives out heat and keeps the star hot. At the point when its hydrogen fuel runs down, the star starts to kick the bucket.
21. How big is that the Sun?
The sun measures 1,392,530 kilometres across, or 109 times the diameter of the planet. If the sun were the dimensions of a football, the planet would be only two millimetres across.
22. How are stars formed?
Stars begin their lives as very thin clouds of hydrogen gas. As each cloud shrinks, the centre grows highly regarded because of the atoms of gas being squeezed together. Eventually, the clouds become so hot that they start to shine as stars.
23. How may be a spacecraft launched?
To escape from the world, a rocket must travel at 11 km per second. one craft couldn’t carry enough fuel to succeed in this speed, it’d be too heavy to go away the bottom. So a spacecraft has separate stages, which jump clear because the lower ones burn up their fuel. Smaller rocket engines may have more stages.
24. How does Rocket Motor work?
On the world, we usually move by pushing or pull ing against something fixed. But in space, there’s nothing to push or pull against, so movement must be a reaction. A bullet fired from a gun kicks the hearth backwards. Hot gas leaving a rocket kicks the spacecraft forward.
25. How does a satellite stay in orbit?
To stay in orbit near the planet, a satellite must travel at about 8 kilometres per second. Once it’s gone into orbit, it’ll remain to circle almost indefinitely. However, if it’s but about 200 kilometres above the planet, the slight dragging effect of the earth’s outer atmosphere will cause it to lose speed and height, and after some years it’s going to use up sort of a meteor.
26. How does a spacecraft return to Earth?
All spacecraft must find the simplest way of slowing down from a speed of the many kilometres per second to relinquish the crew, or cargo, a sucker down. The landing is sometimes done by parachute, but the space vehicle glides down.
27. How do astronauts suspire space?
Our air contains several different gases. the foremost important one is oxygen since this is often what we must inhale order to measure. So astronauts must take an oxygen supply in their cabin and in their spacesuits. Another problem is a way to get obviate the waste of CO2 that’s breathed out. It may be absorbed by chemicals, but on a really long flight, it’d be essential to extract and recycle the oxygen so it may be used again.
28. How do astronauts speak to every other?
If they’re outside the spacecraft or on the Moon’s surface, they need to talk by radio, since sound cannot travel in empty space. However, if they’re
within the atmosphere of the cabin, they will talk normally to every other.
29. How does astronaut make Space Walks?
A person can walk as long as he’s on the surface of a planet where gravity pulls his feet down onto the bottom. In space, an astronaut can only float alongside his spacecraft to which he’s tied by a security line.
30. How will we measure the gap to the moon?
The speed of sunshine is extremely accurately known. It is 299,792 kilometres per second in space. If a lightweight the beam is aimed towards the Moon and reflected back, the space to the moon may be puzzled out.
31. How do unmanned space vehicles work?
Several different forms of unmanned spacecraft are sent to the moon. Some went into orbit around it and took detailed photographs. Others have landed on the surface and tested the conditions there sending messages by radio to the planet. they need television cameras to let the operators see where they’re going. It can start and stop at will, turn corners, and take samples of the lunar dust.
32. How did Apollo get to the Moon?
Apollo which made the primary manned landing in 1969, had to travel piecemeal. First, it had been shot up into Earth orbit then it flew to the Moon and went into lunar orbit. The space vehicle then descended to the surface, leaving the module awaiting its return.
33. How did the Apollo astronauts explore the Moon?
The astronauts most vital task was to gather samples of the lunar rocks and soil. within the first three missions, they explored by foot. within the last three, they used a lunar rover.
34. How did the Lunar Rover work?
The lunar rover was a four-wheeled buggy driven by electric batteries. Its top speed was about 12 kilometres per hour, and it had enough power to travel about 65 kilometres before its batteries dried-up. The last three Apollo flights took a rover.
The rover could carry two astronauts and about 180 kilograms of cargo. It had several cameras and televisions fitted to its frame.
35. How is the space shuttle launched?
The shuttle is launched into space attached to two booster rockets and a huge fuel tank. As it reaches a height of about 43 kilometres, the two booster rockets parachute back to earth. To return, the shuttle fires its engines to head earthwards and glides down.
36. How is the space shuttle used?
The space shuttle is a workshop it carried the space lab into the orbit. Its job is to carry the astronauts, or cargo else both, into orbit around the earth. It can carry or hold six passengers at a time and has a cargo bay 18.3 metres long and 4.6 metres in diameter.
37. Who discovered Jupiter’s Moons?
Galileo Galilei was one of the first people to point a telescope to the sky, making several very in important discoveries. Turning his instrument to the planets he saw that Jupiter has four bright satellites.
38. Who discovered how planets move?
Johannes Kepler 15711630 discovered the true shape of the planets’ orbits around the sun, which are not circles but ellipses. An ellipse has two points within it, each one called a ‘focus’. The sun is situated at one focus, the other one being empty
39. Who discovered Uranus?
William Herschel built the largest telescope of the age 17381822 and discovered the planet Uranus as well as thousands of new objects inside our own galaxy and other galaxies far away.
40. Who was Laika?
Laika, a small Eskimo dog, was the first living thing to be sent into orbit around the Earth. She was launched from the Soviet Union in Sputnik 2 on 3 November 1957.
41. What is Comet?
A comet is an icy body just a few kilometres across orbiting the sun. Particles the size of dust and sand are mixed with the ice. When the comet passes near the sun, the heat turns the ice to gas and the dust pours out into space, making the comet look hazy and perhaps giving it a long tail as well.
42. What is a variable star?
A variable star changes in brightness. Some take a few hours, while others may take many years. Most are swelling and shrinking, becoming brighter and fainter as they do so. Others are pairs of stars, which seem to change in brightness when one passes in front of the other.
43. What is a binary star?
A binary star consists of two stars revolving around each other. The closer they are the faster they revolve. Some binaries take just a few hours to go around once, while others take thousands of years.
44. What are Red Giants and White Dwarfs?
When a star is born, it usually shines steadily for hundreds of millions of years. But eventually, many stars start to puff outwards as a fiery mist. This is the red giant stage. Finally, they shrink into a very hot globe, the size of a planet-a white dwarf.
45. What are Novae and supernovae? Both of these objects are exploding stars, which erupt almost overnight. Several Novae occur our galaxy every year, and some can be seen with
the naked eye.
46 What is a pulsar?
After a supernova explodes, all that is left of a star is a very hot ball of matter a few kilometres across, spinning at a tremendous rate. It sends out a beam of light or radio waves like a revolving searchlight so that it seems to ‘pulse’ on and off. It is called a pulsar,
47. Why can’t we see other solar systems?
The nearest star is over a quarter of a million times as far away as the sun. At this distance, even a large planet would be invisible in the biggest telescope.
48. Why is there life on earth?
All living beings from human beings to bacteria will die if it becomes too hot or too cold, or if there is no air to breathe. No other planet in the solar system has favourable conditions for Earth-like life.
49. Why is there no weight in space?
Weight is the force you feel when the floor, or a chair, stops you from falling towards the centre of the earth. If a hole opened in the ground, you would be weightless while falling down it. This is known as a ‘free fall’. Flying through space everything is in free fall.
50. What is the difference between a planet and a moon? A planet is a dark body orbiting a star. It can only be seen by the starlight it reflects. Almost all the planets in the solar system reflect light from the sun. A moon (or satellite) also shines by reflection, but it revolves around a planet.
51. Why do the moon wax and wane?
The sun can shine (bright) on only one half or hemisphere of the moon. Since it orbits the earth every month, our view of this hemisphere changes. At New Moon, it is turned away from the Earth, and cannot be seen, while at the full moon it is turned towards us. After full, the moon’ waves” or shrinks to invisibility once more.
52. Why is the moon covered with craters?
The lunar craters were probably formed during the first few hundred million years of the moon’s 4500 million year history. They are practically unchanged today because the lunar globe cooled down quickly and preserved them and there is no atmosphere to produce winds and weather, which could have worn these features away.
53. Why is the new moon invisible?
The true new moon lies almost between the Earth and the Sun. The sun is so dazzling that nothing can be seen near it. Also, the night hemisphere of the moon is turned towards the earth.
54. Why is there no life on the Moon?
The life forms that are familiar to us need air and water, as well as protection from some dangerous rays sent out by the sun. The moon has no atmosphere, no water on its surface, and it is completely exposed to space. Also, the temperature of atmosphere at midday is higher than that of boiling water.
55. Why is Mars a dead world?
The two Viking spacecraft which reached the planet in 1976 and examined its surface did not find any sign of life. They also discovered that the temperature is always below freezing point, and the atmosphere is thin and unbreathable.
56. Which planet spins the fastest?
Jupiter, which is the largest of the planets in the Solar System, spins on its axis in the shortest time, only 9 hours and 50 minutes.
57. Why is Mars red?
This red dusty material covers to the planet’s surface and in sometimes blown into huge dust in of the reason storms.
58. Why is Venus so hot?
Although it is always cloudy, enough sunlight breaks through to heat, the ground during its four-year ‘day’.
59. Why is it difficult to see mercury?
These appearances are known as ‘elongations’. At eastern elongation, it is low in the western sky after sunset. At western elongation, it rises in the dawn sky. At these times it looks like a star.
60. What is the Milky Way?
This band is caused by distance stars, which cannot be separated with the by the naked eye.
Read Also How To Earn Money Online?