The Big Bang Theory is the dominant scientific theory about the origin of the universe. According to the big bang, the universe was created sometime between 10 billion and 20 billion years ago from a cosmic explosion that hurled matter in all directions.
The big Bang Theory
After the universe’ existence it apparently inflated (the "Big Bang"), expanded and cooled, going from very, very small and very, very hot, to the size and temperature of our current universe. It continues to expand and cool to this day and we are inside of it. A common misconception is that space existed prior to the Big Bang. It did not.
a black hole is a region of space that has so much mass concentrated in it that there is no way for a nearby object to escape its gravitational pull. You can't see a black hole directly, since light can't get past the horizon.
The explain what a worm hole is we need to know what a white hole is. A white hole is the exact opposite of a black hole. Instead of sucking things in, it spits things out. A worm hole is thus thought of as a combination of a black hole and a white hole. For example- if a person were be sucked in to a worm hole you would spit out into the opposite. Scientists believe that the opposite side could be another universe.
The Milky Way system is a spiral galaxy consisting of over 400 billion stars , plus gas and dust arranged into three general components as shown to the left:
The halo - a roughly spherical distribution which contains the oldest stars in the Galaxy,
The nuclear bulge and Galactic Center.
The disk, which contains the majority of the stars, including the sun, and virtually all of the gas and dust
The Milky Way Galaxy
The Milky Way is the galaxy which is the home of our Solar System together with at least 200 billion other stars and their planets, and thousands of clusters and nebulae including at least almost all objects of Messier’s catalog which are not galaxies on their own (one might consider two globular clusters as possible exceptions, as probably they are just being, or have recently been, incorporated or imported into our Galaxy from dwarf galaxies which are currently in close encounters with the Milky Way .)
First landing on the moon
Neil Alden Armstrong was born on August 5,1930 in Wapakoneta, Ohio. He holds a degree in aeronautical engineering from Purdue University and a masters degree in aerospace engineering from the University of Southern California. From 1949 to 1952, Armstrong was a naval aviator. Upon leaving military service, he became a test pilot. While serving as a test pilot, he was chosen to be a member of the astronaut corps. Though he was on the backup crew of many previous flights, his first space flight occurred in 1966 aboard Gemini 8 . During this flight, he and fellow astronaut David Scott successfully performed the first docking in space between two vehicles. In July of 1969, Neil Armstrong was the commander of Apollo 11 , America's first attempt to land a manned vehicle on the Moon. On July 20, 1969 Commander Armstrong and fellow astronaut Edwin Aldrin successfully touched down on the lunar surface. As Armstrong became the first person to touch the Moon's surface, he spoke the unforgettable phrase, "That's one small step for man; one giant leap for mankind". He and Aldrin explored the Moon's surface for 2.5 hours. Armstrong was awarded the Presidential Medal of Freedom in recognition of his accomplishments and his contributions to the space program .
The Solar System
The solar system consists of the Sun, the nine planets, sixty-three (63) satellites of the planets, a large number of small bodies (the comets and asteroids), and the interplanetary medium. The orbits of the planets are all more or less in the same plane (called the ecliptic and defined by the plane of the Earth's orbit). The ecliptic is inclined only 7 degrees from the plane of the Sun's equator. The whole solar system, together with the local stars visible on a clear night, orbits the center of our home galaxy, a spiral disk of 200 billion stars we call the Milky Way. Our solar system is situated within the outer regions of this galaxy, well within the disk but about 28,000 light years from the Galactic Center. Therefore, the Milky Way shows up as a luminous band spanning all around the sky.
The Eight Planets
Mercury is the closest planet to the Sun. Its surface has many thousands of impact craters as a result of being bombarded by objects since the solar system's early days. Since Mercury has no protective atmosphere, the temperature on the surface ranges from extremely hot on the side facing the Sun to extremely cold on the side that faces away from the Sun.
Venus is named after the Roman goddess of love and beauty. This is one of those cases where beauty is only skin deep, though, as the surface of Venus is a very unpleasant place featuring very high temperatures, winds that blow hundreds of miles per hour and an atmosphere of sulfuric acid. Venus is an example of runaway greenhouse effect on a planetary scale.
They always say there's no place like home. Our home planet is a very beautiful place with the most varied surface in the entire solar system. From a distance, our planet looks like a beautiful big blue marble.
The Red Planet is named after the Roman god of war. It's distinctive rust color is easily seen through a small telescope. The surface of Mars features many mountains, canyons and even polar ice caps that look a lot like those here on Earth. In ancient times, Mars may have harbored some kind of life, and there is a lot of research going on now trying to get a definitive answer as to whether we are the only life forms in the solar system.
Jupiter is the largest planet in our solar system. It has at least sixty-one moons and features the Great Red Spot, which is a huge "storm" that has been observed from here on Earth for over three hundred years.
The Eight Planets
Saturn is one of the most beautiful planets in the solar system. It's fascinating system of rings have been a source of wonder since we first saw them with the earliest telescopes. Although the rings look fairly simple through a small telescope, spacecraft pictures have revealed that what looks like two rings through a telescope is actually hundreds of individual ring systems. In addition, Saturn has so many moons that it is like a miniature solar system.
Uranus is one of the giant gas planets in the solar system. Its mysterious blue-green color provides very few clues as to what is going on underneath the surface clouds. Uranus also has a very faint ring system that we didn't know existed until the planet was visited by the Voyager spacecraft.
Neptune was the last stop the Voyager mission made before if left our solar system. What we found out from Voyager was that Neptune has winds that blow hundreds of miles per hour and a moon that features "geysers" of nitrogen that erupt and leave dark marks on the surface.
Pluto is one of the "dwarf planets" in our solar system. Pluto is so far away that the Sun is just a dim point of light that looks a lot like any other star. Pluto has three moons, one of which is almost as big as the planet itself.