the majority of large galaxies are spiral galaxies, or large discs in rotation around a bulge of small size.
Scientists estimate that there are more than 100 billion galaxies scattered throughout the universe. Astronomers have photographed millions of them through telescopes. The most distant galaxies ever photographed are as far as 10 billion to 13 billion light-years away. A light-year is the distance that light travels in a vacuum in a year. Galaxies range in diameter from a few thousand to a half-million light-years. Small galaxies have fewer than a billion stars. Large galaxies have more than a trillion.
Galaxies are unevenly in space. Some have no close neighbor. Others are in pairs orbiting others. But most of them are found in groups called clusters. A cluster may contain from a few dozen to several thousand galaxies. It may have a diameter as large as 10 million light-years.
2.If your familiar with the use of satellites for transmitting TV signals and phone calls, and for satellite navigation systems like those used in cars and airplanes, you may not be as familiar with how much satellites have helped us to understand and take care of earth. Satellites have studied oceans, the atmosphere, clouds, weather, rain forests, deserts, cities, farmlands, ice sheets, and just about everything else on and even in Earth.
Satellites have shown that the ozone is disappearing over some parts of Earth. So we must find and use chemicals that are less damaging to our atmosphere. How the space race impacted on technology is the space race got different countries to develop rockets, man-made satellites, and space-stations. Man made satellites were used for spying during the cold war and without them some cell phones would not work. If you had a friend living in another country, you would have some trouble communicating unless you sent letters.The telescope is one of the technological advancements today and will most likely improve in the future as well. The telescope met technology in 1609 by an Italian scientist. His name was Galileo. He had a telescope that was just like a pair of opera glasses and he used the lens to magnify things. In 1704, A man named Sir issac Newton invented a new type of telescope. He used a curved mirror. The telescope newton invented was way better and could magnify a million times better than glasses lens. The space race was a race and it started after the cold war and world war 2. The united states and soviet union raced to win space technology and to go exploring more things. The space race ends 1970-1975
the Space Race began after the soviet launch of Sputnik 1 on 4 October 1957.
SPACE RACE TIMELINE
Nov.3,1957-soviet launches an animal into space
Jan.31,1958-1st American satellite sent into space.
April 12,1961- Yuri Gagarin was the 1st person in space.
May 5,1961-Alan Sheppard was the first American in space.
May 25,1961- JFK made a speech to congress saying that Americans will walk on the moon before the end of the decade.
March 18,1965- Russian astronaut walked in space
June 3, 1965- 1st American space walk
July 20, 1969- Neil Armstrong and Buzz Aldrin walked on the moon.
3.The earliest evidence of constellations comes from inscribed stones and clay writing tablets dug up in Mesopotamia. The bulk of the Mesopotamian constellations were created within a short time from around 1300 to 1000 B.C
The ancient constellation Argo Navis was so big that it was broken up into a couple different constellations, for the stellar cartographers.
Did you know there are eighty-eight constellations that can be found in the night skies? To an average person, a constellation is a group of illuminated stars which form a picture of sorts. But to an astronomer, a constellation points to a specific area in the night skies. There are 12 zodiac constellations. The twelve zodiacal constellations are probably the most commonly known among the eighty-eight star patterns.
They can be seen from both the northern and the southern hemispheres. The twelve constellations are Cancer, Aquarius , Gemini, Sagittarius, Taurus, Virgo, Pisces, Libra, Leo, Capricorn, Aries, and Scorpio. Two of the most common zodiacal constellations are Sagittarius and Taurus. Within the stars that make Sagittarius constellation, is the center of the galaxy known as the milky way. Therefore when you look at this constellation you are actually looking at the center of the galaxy.
"The history of constellations." Essortment Articles: Free Online Articles on Health, Science, Education & More... N.p., n.d. Web. 14 Jan. 2011.
4. Our solar system formed about 5 billion years ago, from a cloud of dust and
gas called the nebula. The Sun was formed in a nebula like other stars in the galaxy by an interstellar cloud of dust and hydrogen.
A nebula can also be called a stellar nursery. There are many stellar nurseries in galaxies. Stars start as clouds of gas and dust, made of 97% of hydrogen and 3% of helium. They collect more as they grow. When enough gas and dust is collected into a ball, the temperature inside of it reaches 15 million degrees.
It becomes a giant ball because of the gas and dust under its own gravity and weight. After it becomes a giant ball nuclear fusion begins to start and the ball of gas and dust start to glow. That's how a new star is born.
INNER AND OUTER PLANETS
They can be put into two groups. One group has the four planets closest to the Sun , which are Mercury, Venus, Earth and Mars. These are the Inner Planets or the Terrestrial Planets. The other group has the four planets furthest from the Sun, Jupiter, Saturn, Uranus and Neptune. These are known as the Outer Planets or the Gas Giants.
DIFFERENCES BETWEEN THE INNER PLANETS AND OUTER PLANETS
Inner planets are small. Earth is the largest of the inner planets . Mercury is the smallest with a diameter of 4,878 km. Inner planets have greater density and have solid surfaces, also has varied atmospheres. The inner planets have No rings and only a few moons. But they orbit the sun quickly. Now talking about outer planets, they are HUGE and have balls of gas with no surface and smaller density. The atmospheres of the outer planets consist mostly hydrogen and helium while the inner planets have only some gasses like helium. It's like the opposite of inner planets. It spins quickly while inner spins slowly. They also have lots of rings and moons.
http://www.bobthealien.co.uk/innerouter.htm
5. Theories of the universe
In ancient times people thought that God made the universe. Most of the people think that today too. The most popular theory in science today is the big bang theory. They thought that the universe started at a certain point in time about 15 to 20 billion years ago.
There are only two legitimate options for the origin of the universe:
Someone made the universe or the universe made itself (random chance).
The original Big Bang Theory is still to explain the sudden appearance of everything from nothing while Darwinian Evolution tries to explain the origin of life forms from their so called simpler ancestors.
The Big Bang is that the entire universe was compacted into a teeny tiny little ball which after coming into existence for no apparent reason in the first place then exploded into all space, time, matter and energy right away. And that’s the big bang theory.
I personally don't know what to believe. I mean there were no human observers to the origin of the universe, the origin of life, or to the origin of type of living organism. They were just historical events which have only happened once. And no one has ever seen anything created, or has anyone ever seen a fish evolve into an amphibian or an ape evolve into man.
