Josyvan , 7/10/2007
Question: How rockets work?
Soyuz RocketThis Russian Soyuz rocket carried cosmonauts to the Mir space station in 1992. The boosters attached to the outside of the first (bottom) stage of the rocket are clearly visible inJosyvan , 7/10/2007
Question: How rockets work?
Thrust is a measurement of the force of a rocket, or the amount of “push” exerted backward to move a rocket forward. Thrusts vary greatly from rocket to rocket. Engineers measureJosyvan , 7/10/2007
Question: How rockets work?
The motion of a rocket is much like the motion of a balloon losing air. When the balloon is sealed, the air inside pushes on the entire interior surface of the balloon with equal force. IfJosyvan , 7/10/2007
Question: How rockets work?
All rockets—whether small or large, simple or complex—work by the basic principle of action and reaction, which was formulated by English scientist Sir Isaac Newton in 1687.Josyvan , 7/10/2007
Question: How astronauts work?
The very first astronauts were little more than human test subjects, but today’s astronauts are pilots, scientists, and engineers with active roles in many aspects of their missions. InJosyvan , 7/9/2007
Question: How stars produce energy?
Fusion: The Energy of the SunDiscovery Enterprises, LLCFor many years astronomers were puzzled about how the Sun provided energy. While Earth’s fossil record indicates that the Sun hasJosyvan , 7/9/2007
Question: How Light Travels?
Diffraction and Interference of LightWhen light passes through a slit with a size that is close to the light’s wavelength, the light will diffract, or spread out in waves. When lightJosyvan , 7/9/2007
Question: How about Eclipse?
Total Solar EclipseDuring a solar eclipse, the moon moves between the sun and the earth. The light from the outer part of the sun’s atmosphere, called the corona, became visible during aJosyvan , 7/9/2007
Question: How about Eclipse?
If the earth’s orbit, or the ecliptic, were in the same plane as the moon’s orbit, two total eclipses would occur during each lunar month, a lunar eclipse at the time of each fullJosyvan , 7/9/2007
Question: How about Eclipse?
The length of the moon’s umbra varies from 367,000 to 379,800 km (228,000 to 236,000 mi), and the distance between the earth and the moon varies from 357,300 to 407,100 km (222,000 to 253Josyvan , 7/9/2007
Question: How about Eclipse?
EclipseThe earth, lit by the sun, casts a long, conical shadow in space. At any point within that cone the light of the sun is wholly obscured. Surrounding the shadow cone, also called theJosyvan , 7/9/2007
Question: How about Eclipse?
Eclipse, in astronomy, the obscuring of one celestial body by another, particularly that of the sun or a planetary satellite. Two kinds of eclipses involve the earth: those of the moon, orJosyvan , 7/9/2007
Question: How about Black Hole?
Stellar EvolutionStars begin life as diffuse clouds of dust and gas. These clouds condense to form stars, after which the stars can develop into a variety of objects, depending on how muchJosyvan , 7/9/2007
Question: How about Black Hole?
Albert EinsteinIn 1905 German-born American physicist Albert Einstein published his first paper outlining the theory of relativity. It was ignored by most of the scientific community. In 1916Josyvan , 7/9/2007
Question: How about Black Hole?
Dragging Space and TimeThe results of two studies announced in early November 1997 provide unprecedented support for “frame-dragging,” a concept predicted by physicist AlbertJosyvan , 7/9/2007
Question: How astronomers work?
5.Radio AstronomyRadio TelescopesThe Very Large Array is a collection of parabolic dish antennas, located near Socorro, New Mexico. The 27 antennas are attached to a system of Y-shaped tracks;Josyvan , 7/9/2007
Question: How astronomers work?
3.Ultraviolet AstronomyUltraviolet light has wavelengths longer than X rays, but shorter than visible light. Ultraviolet telescopes are similar to visible-light telescopes in the way theyJosyvan , 7/9/2007
Question: How astronomers work?
2.Gamma-Ray and X-Ray AstronomyGamma-Ray TelescopeA gamma-ray telescope detects radiation that has a shorter wavelength than visible light. Gamma rays enter the telescope through the chargedJosyvan , 7/9/2007
Question: How astronomers work?
Observational astronomers use telescopes or other instruments to observe the heavens. The astronomers who do the most observing, however, probably spend more time using computers than they doJosyvan , 7/9/2007
Question: How astronomers work?
Electromagnetic SpectrumThe electromagnetic spectrum is a range of energetic radiation that includes radio waves, microwaves, infrared light, visible light, ultraviolet light, X rays, and