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Science Ch.3-7k/r

QuestionAnswer
Patterns of stars in the sky constellations
True or false. stars are hot glowing spheres of hot glowing gas True
light you see with your eyes visible light
True or fale. Light is a form of necular fussion False. light is a form of electromagnetic radiation.
energy that can travel directly through space in the form of waves. electromagnetic radiation
the distance between the crest of one wave and the crst of the next wave wavelength
the range of wavelengths of electromagnetic waves spectrum
True or false. the spectrum of visible light is composed of the colors red, orange, yellow, green, blue, and violet. True.
True or false. Stars in a constellation are very close together. False. stars in a constellation are NOT very close together.
true or false. The electromagnetic spectrum includes radio waves, infared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. True.
Are infared waves longer or shorter than ultraviolet waves? Infared waves are longer than ultraviolet waves.
What are examples of electromagnetic waves that you might use or experience every day? visible light, radio waves, ultraviolet waves in sunlight, and having an X-ray taken.
true or false. all telescopes scatter different types of electromagnetic radiation, including radio waves. False. MOST telescopes COLLECT AND FOCUS types of elctromagnetic radiation, including VISIBLE LIGHT.
use convex lenses to gather a large amount of light and focus it into a a small area. Refracting telescope
piece of transparent glass, curved so that the middle is thicker than the edges. convex lenses
A refracting telescope like the on Galileo used, had 2 lenses. what were they? eyepiece lens and objective lens.
What is the focal length of the lens? when light passes through the objective lens, the lens focuses the light at a certain distance away from the lens.
When did Isaac Newton build the first reflecting telescope? 1668
What is a reflecting telescope? A reflecting telescope uses a mirror instead of an objective lens.
What is used to detect radio waves from objects in space? radio telescopes
True or false. An observatory is a building that contains at least five telescopes. False. An observatory is a building with ONE OR MORE telescopes.
True or flase. To collect data from visible light telescopes on Earth, astronomer only have to work for three hours a day. False. To collect data from visible light telescopes on Earth, astronomers have to STAY UP ALL NIGHT.
True or false. Radio telescopes can be used 24 hours a day. True.
True or false. Most ultraviolet radiation, X-rays, and gamma rays are blocked by the Earth's atmosphere. True. To detect these wavelengths, astronomers have placed telescopes on satellites.(Hubble Space Telescope, Chandra X-Ray Observatory)
Breaks the light from an object into colors and photographs then resulting spectrum. spectrograph
True or false. Most telescopes we have today have spectrographs. True.
True or false. Astronomers use spectrographs to get their info about stars, including their chemical compositions and temperatures. True.
True or false. Chemical elements in a planet's atmosphere disperse light from the atmosphere. False. Chemical elements from a STAR'S atmosphere ABSORB light from the atmosphere.Each element absorbs light at a different wavelength, and each absorbed wavelength is shown as a dark line on a spectrum. Each element has its own unique set of lines.
True or false. Astronomers use star's elemagnetic radation to infer which elements are found in planets and the temperature of the sar. False. Astronomers use star's SPECTRUM to infer which elements are found in STARS and the temperature of the star.
What is the closest star to Earth? the sun
What is the second closest star to Earth? Proxima Centauri
Giant flat scructure that contains hundreds of billions of stars, called galaxy. Milky Way
all of space and everything in it Universe.
How many galaxies are in the universe? Billions! Since galaxies are so far apart, most of the universe is empty space.
The distance that light travels in one year. It is a unit of distance. It takes light around 4.2 years to reach Earth from Proxima Centauri. Light-year
How far away is Proxima Centauri? 4.2 light-years
It is the apparent change in postiton of an object when you look at it from different places. Parallax. Astronomers usually use parallax to measure distance s of nearby stars.
When do nearby stars appear to change position between January and July? Earth moves, so nearby stars appear against a different part of the distance background.
Astronomers classify stars according to their physical characteristics. The main characteriscs used to claaify stars are...? size, temperature, and brightness.
The sun is what size. a medium star.
Very large stars are called, what? giant stars or supergiant stars.
True or false. Some stars smaller than the sun True. White dwarf stars are about tha same size as Earth.
How big are neutron stars? 20k in diameter.
True or false. a star's brightness reveals its temperature. False. A star's COLOR reveals its temperature.
True or false. Stars differ in brightness. True. Brightness depends on the star can be described in 2 different ways: apparent mgnitudeabsolute magnitude
It is a star's brightness as seen from Earth. Apparent magnitude
the brightness a star would have if it were at a standard distance from Earth. Absolute brightness
A graph relating the temperature and brightness of stars. Hertzspurng-Russell DiagramMost stars in the H-R Diagram form a diagonal line, called main sequence.
What is in main sequence? surfece temperature increases as brightness increases. 90% of stars are main sequence stars are main sequence stars.
True or flase. The sun is a main sequence star. True.
Created by: tnicholson
 

 



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