Compare and Constrast Essay on Astronomy

This essay has a total of 1312 words and 6 pages.

astronomy

Space exploration has been going on since the 1960s. Both women and men have traveled in
space. Every day we are discovering different things about space from satellites and
astronauts, and every day more people are landing on the moon. The first human, the first
animal, and the first spacecraft in orbit, were all Soviet achievements.

There are many reasons why space is explored and why people take the time to explore the
solar system. One reason is that we want to find out how our solar system was created and
how it works, and another reason is that we want to find out how all the planets move and
how they change rotations. We also want to learn about everything on the planets and how
to make advanced enough spacecrafts so that we can visit all the planets.

The first man to travel in space was Yuri Gagarin. He made history on April 12, 1961, by
orbiting the earth in the Votsok 1. His flight was one hour and 48 minutes long, going at
a speed of about 17,000 mph on the Votsok 1 as he circled the earth. Gagarin was later
killed in a crash of a test airplane.

Neil Armstrong was the first person to ever land on the moon. He was born in Wapakoneta,
Ohio, and after he graduated from college in 1955 he joined NASA. In 1962 he became the
first civilian to enter an astronaut training program. In 1969 Armstrong lead the Apollo
11 mission and became the first person to set foot on the moon. His companions were Edwin
E. Aldrin, Jr., and Michael Collins. In 1971 Armstrong became a professor of aerospace
engineering at the University of Cincinnati.

Valentina Vladimora Nikolayeva Tereshkova was the first woman to be in space. She joined a
Soviet training program in 1961 and in 1963 she successfully orbited the earth 48 times in
the Votsok 6.

"Born Galileo Galilei, his main contributions were, in astronomy, the use of the telescope
in observation and the discovery of sunspots, lunar mountains and valleys, the four
largest satellites of Jupiter, and the phases of Venus." In December 1609, Galileo built a
telescope of 20 times magnification, and with it he could see craters and mountains on the
moon. He also saw that the Milky Way was made up of stars and looked at the four largest
satellites of Jupiter.

Herman Oberth, a German, was the second theoretician, with perhaps the greatest vision.
His work had the biggest impact on the new and exciting field of rocket science and space
exploration. His first book, published in 1923, was his most famous, and was called "The
Rocket into Interplanetary Space." It includes proofs about the movement of rockets
through space and atmosphere.

"Tsiolkovsky, Konstantin Eduardovich (1857-1935), Russian scientist and inventor, a
pioneer in rocket and space research. At the age of nine he lost his hearing almost
completely and he studied mostly at home; he worked as a high school mathematics teacher
until retiring in 1920. In the mid-1880s Tsiolkovsky began research in aerostatics,
publishing articles containing plans for a metal dirigible (1892), an airplane (1894), and
a spaceship (1903). During the 1920s he elaborated his theory of multistage rockets and of
the flight of jet engines. He was made (1918) a member of the Soviet Academy. Among his
books are Dreams of Earth and Sky (1895) and A Rocket into Cosmic Space (1903), in which
he proposed the use of liquid-propellants for spaceships. A crater on the moon's far side
is named after him."

The Sputnik 1 was the first artificial satellite to orbit the earth. "Sputnik 1 was an
aluminum sphere, 58 cm (23 in) in diameter, weighing 83 kg (184 lb). It orbited the earth
in 96.2 minutes." At the end of 57 days the satellite re-entered earth's atmosphere and
was destroyed by aerodynamic frictional heat.

Voyager 1 and Voyager 2 were both spacecraft that were launched to Jupiter. Voyager 2 was
launched on August 20, 1977, and Voyager 1 was launched 2 weeks after on September 5,
1977. Voyager 1 did make it to Jupiter before Voyager 2 because it took a shorter and
quicker route.

NEAR, the Near Earth Asteroid Rendezvous, is a spaceship, and NEAR's mission is to explore
an asteroid called Eros. The journey time to Eros is 35 months and the cost for launching
and building is $122 million. Four years of this operation will cost $40 million. Eros was
picked for a couple of reasons and one of them was that it might help solve a mystery. The
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