|
The Planet Venus
Space Travel
Since the beginning of time, people have looked to the heavens with wonder. In the book of Genesis in the Bible, the people decided to build a tower that would reach heaven. According to the scriptures, God saw that people could do anything they wanted to do if they worked together, so He caused people to speak different languages and scattered them around the earth -- He later destroyed the tower as well. The attempt to build the Tower of Babel happened after the great flood, but before Abraham's covenant with God. Yes, humans have always been fascinated by the sky…the heavens….and the desire to reach out and touch it.
Back in the 1960s, President John Kennedy challenged America to put a man on the moon before any other nation could accomplish the feat. On July 16, 1969, Apollo 11 was launched from the Kennedy Space Center with astronauts Neil Armstrong, Michael Collins, and Edwin E. Aldrin, Jr. aboard; the destination was the moon. On July 20, 1969, Neil Armstrong became the first man to set foot on the moon. He uttered the historic words, "One small step for a man, one giant leap for mankind." Space travel became a reality.
Since that historic day in 1969, we have sent unmanned space craft to Mars and Saturn. They have sent back some truly amazing photographs. We are learning more and more about our solar system and the other plants that circle our sun.
America's space program is still at work and the possibility of space travel is a very real possibility. There are many problems that must be overcome before a manned space craft can be launched and sent to other planets, but I do believe that someday it will happen -- maybe not in my lifetime, but someday.
See Also:
History of Astronomy (IAU Commission 41)
Astrology Beliefs
The Stars
Our sun is a star. It is one of the billions of stars in the Milky Way Galaxy. On a clear night, when you look up at the sky, you can see thousands of stars with your naked eye. If you have a pair of binoculars or a telescope, you can see more stars than you could ever hope to count.
Each star is unique, but they all share things in common as well. Stars are born from interstellar gas clouds, nuclear fusion causes them to shine and stars die. Sometimes the death of a star is a very dramatic event.
Cold interstellar clouds or nebula, like the Orion Nebula and the Eagle Nebula, are the incubators and nurseries from which stars are born. An extremely simplified description is that gravitational collapse happens and forms a rotating gas globule. The resulting globule spins faster and faster. The central core becomes a star while the other material becomes planets or asteroids.
The life of a star begins and ends with a battle between two forces: gravity and pressure. It takes energy for a star to live, and this energy comes almost entirely from nuclear fusion of lighter elements into heavier elements. This is the energy through which a star can shine for millions or billions of years.
Stars fuse hydrogen to helium for most of their lifetime. This is referred to as the "main sequence" of a star's life. Our sun, Vega, Sirius, and Spica are all stars that are in their main sequence. Once the hydrogen in the core of a star has been used up, the star becomes a red giant like Betelguese, Arcturus, Aldebaran and Antares.
A star's life is limited because the hydrogen at the core is not self-replenishing and will eventually be used up. A star cannot depend upon thermal energy to resist the pull of gravity forever, and a star's final fate depends on whether something other than thermal pressure manages to halt the relentless crush of gravity. |
|
More articles:
Space Debris May be Catastrophic to Future Missions (and Google ...
Basic Astronomy - General Astronomy Quiz
Hubble Space Telescope
Laughter is the BEST medicine!
Hubble Space Telescope
Solar Eclipses
NASA
In 1958, the Congress of the United States enacted, and the President Dwight D. Eisenhower signed, the National Aeronautics and Space Administration Act (NASA). The act begins with a very simple statement; "An Act to provide for research into the problems of flight within and outside the Earth's atmosphere, and for other purposes."
The Cold War between the United States and (what was) the Soviet Union was in full swing. With the passing and signing of the act that established NASA, what has come to be known as the "space race" was kicked off. The Soviet Union had launched Sputnik 1 and had an apparent head start in the race to space.
The United States caught up quickly. In January 1958, Explorer 1 (America's first earth satellite) was launched.
Then NASA launched human space flight initiatives with Mercury's single astronaut program (flights during 1961-1963) to determine if a human could survive in space.
The Project Gemini (flights during 1965-1966) with two astronauts to was used to practice space operations, like rendezvousing and docking spacecraft and extravehicular activity (EVA or space walks).
This was followed with Project Apollo (flights during 1968-1972) to explore the Moon. Since then NASA has conducted robotic missions to the Moon (Ranger, Surveyor, and Lunar Orbiter); Venus (Pioneer Venus), Mars (Mariner 4, Viking 1 and 2), and the outer planets (Pioneer 10 and 11, Voyager 1 and 2).
NASA has had its problems over the years. The space shuttle Challenger blew up on January 28, 1986, killing seven astronauts. The space program was grounded for two years. Another tragedy happened on February 1, 2003, when the space shuttle Columbia disintegrated on re-entry. All seven people on board were killed instantly.
Space travel is not without its dangers, but space in the next great frontier for mankind to conquer. You can be sure that the space program and NASA will continue into the foreseeable future.
Related Topics: Deep Sky Objects,
The Planet Mercury, The Future of Space Travel
|