Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
79 Cards in this Set
- Front
- Back
|
A device thatw makes distant objects appear closer
|
TELESCOPE
|
|
|
How do telescopes work/
|
they collect and focus light and other forms of electromagnectic radiation
|
|
|
Energy that can travel through spaces in the orm of waves and does NOT require a medium?
|
ELECTROMAGNETIC RADIATION
|
|
|
Visible light is a ____ of electromagnetic radiation
|
form
|
|
|
Visible light is the form of electro. magn. radiation that we ___ as the visible light or color ___.
|
see
spectrum (color) |
|
|
What is a waavelength?
|
the distance between the crest of one wave and the crest of the next
|
|
|
What is a RANGE of waves in order of increasing frequency?
|
SPECTRUM
|
|
|
What is the spectrum of visible light made of?
|
the colors red, orange, yellow, green, blue , indigo and violet or
ROYGBIV |
|
|
WHAT DOES THE ELECTROMAGNETIC SPECTURM INCLUDE?
|
The entire range of radio waves, infrared radiation, visible light, ultraviolet radiation, Xrays and gamma rays.
|
|
|
A device that uses lenses or mirrors to collect and focus visible light is what type of telescope?
|
OPTICAL
|
|
|
Which type of telescope uses CONVEX LENSES to gather and focus light?
|
REFRACTING TELE.
|
|
|
What are convex lens?
|
a piece of transparent glass that is curved so that the middle is thicker than the edges
|
|
|
Which type of telescope uses a curved mirror to collect and focus light?
|
REFLECTING TELE.
|
|
|
What devices are used to detect radio waves from objects in space.
|
RADIO TELESCOPES
|
|
|
What is a building that has one or more telescopes and that is often located on mountaintops or in space?
|
OBSERVATORY
|
|
|
WHY are many observatories located on mountain tops and or in space?
|
So that the atmosphere won't cause disotrion or block out electromag. waves
|
|
|
What is an advanced telescope?
|
It has computer and lasers that are used to allow automatic adjustments and to monitor conditions in the atmosphere
|
|
|
Why do we use telescopes in space?
|
Xrays, gamma rays and most ultraviolet radiation is blocked by the atmosphere. in space there is no interference
|
|
|
Imaginary patterns used to identify groups of stars is called?
|
CONSTELLATIONS
|
|
|
How are STARS classified?
|
By color, temperature, size and compostion and brightness
|
|
|
A stars ____ revels its surface temperature .
|
COLOR
|
|
|
The ____ ____are at around 3,200 degrees
|
Coolest stars
|
|
|
The coolest stars are a ___ color.
|
reddish
|
|
|
Stars around 5,500 degrees appear what color?
|
yellow
|
|
|
The hotest stars are around _____ degrees.
|
20,000 celsius
|
|
|
What color are the hottest stars?
|
bluish
|
|
|
Most stars are much smaller than our ___>
|
SUN
|
|
|
Very large stars are called ___ stars, or ____ ___?
|
giant,
super giants |
|
|
What size are the dwarf stars and what color?
|
about the size of Earth and are white.
|
|
|
How would you compare a neutron star to white dwarf?
|
Even smaller than the dwarf
|
|
|
What device breaks light into colors and produces an image of the spectrum?
|
SPECTROGRAPH
|
|
|
WHAT are spectrograph used for ?
|
to determine the elements in the stars.
|
|
|
When light is seen through a spectrograph what happens?
|
Each absorbed wave length is shown as a dark line on a spectrum.
|
|
|
What does the brightness of the star depend/
|
both a star's size and temperature.
|
|
|
A star's brightness as seen from Earth is called?
|
APPARENT BRIGHTNESS
|
|
|
A stars brightness if it were seen from a standard distance from Earth is called?
|
ABSOLUTE BRIGHTNESS
|
|
|
hOW DO YOU MEASURE DISTANCES
|
THE LIGHT YEAR
|
|
|
What is a light year?
|
THE DISTANCE THAT LIGHT TRAVELS IN ONE YEAR, ABOUT 9.5MILLION KILOMETERS
|
|
|
What is a parallax?
|
the apparent change in position of an object when you look at it from different places
|
|
|
What is a parallax in Astronomy?
|
THE CHANGES IN POSITION OF OBJECTS TO MEANSURE DISTANCES TO NEARBY STARS.
|
|
|
What's the Hertxsprung- Russell Diagram?
|
a graph showing the patterns of stars and showing their surface temperatures and absolute brightness.
|
|
|
What is the Hertzsprung-Russell Diagram used for?
|
used to classify stars and understan how stars change over time
|
|
|
A diagonal area on the H-R Diagram in which 90% of the stars fall.
|
MAIN SEQUENCE
|
|
|
A large cloud of gas and dust spread out over an IMMENSE VOLUME?
|
NEBULA
|
|
|
A large amount of gas in a relately small volume?
|
STAR
|
|
|
An area of gas that contracts in the densest part of the nebula. It becomes so dense and hot that nuclear fusion starts.
|
PROTOSTAR
|
|
|
Larger stars burn at a ____ rate and so what happens?
|
FASTER RATE
THEY BURN OUT FASTER THAN SMALLER STARS |
|
|
HOW DO STARS DIE?
|
After a star runs out of fuel the core shrinks and outer potion expands and then becomes a red giant, then super giant, eventuall becoming a white dwarf, a neutron star or a BLACK HOLE.
|
|
|
What are the stars with the blue white core being all that is left behind.
|
White Dwarf
|
|
|
What do we call it when a supergiant runs out of fuel and it explodes suddenly
|
SUPERNOVAS
|
|
|
After a supernova, the material cqan form a ____ star that is even smaller and denser than a white dwarf.
|
NEUTRON
|
|
|
A spinning neutron star that can give off pulsating waves is called?
|
PULSAR
|
|
|
What is an object with gravity so strong that nothing can escapte it?
|
BLACK HOLE
|
|
|
Most stars are members of a group of ? multiple star system
|
two or more stars
|
|
|
A star system with two stars are called ____ stars
|
BINARY
|
|
|
When one star periodically blocks the light from another.
|
ECLIPSING BINARY
|
|
|
How are star clusters formed?
|
believed to have been formed from the same nebula at the same time and are about the same distance from earth
|
|
|
A HUGE group of single stars, star systems, star cluster, dust and gas bound together by gravity
|
GALAXY
|
|
|
IF a galaxy has a bluge in the middle and arms that spiral outward what it is?
|
SPIRAL GALAXY
|
|
|
What type of galaxy looks like round or flattened balls?
|
ELLIPTICAL GALAXY
|
|
|
When a galaxy is not shapped right and is typically smaller, what is it?
|
IRREGULAR GALAXY
|
|
|
Explain what a QUASAR is like?
|
Astronomers believe they are young galaxies with black holes at their center, which look like distant stars
|
|
|
A spiral galaxy in which the Earth is located?
|
MILKY WAY
|
|
|
What is a type of shorthand used by scientists to express very large or small numbers?
|
SCIENTIFIC NOTATION
|
|
|
The theory that states that the universe formed in an instant billions of years ago in an enormous explosion
|
BIG BANG THEORY
|
|
|
What did Hubble discover about the movement of galaxies?
|
they are moving away from us and one another.
|
|
|
What does Hubble's law state?
|
the farther away a galaxy is the faster it is moving away from us.
|
|
|
What did the Big Bang leave in the form of thermal energy?
|
COSMIC BACKGROUND RADIATION
|
|
|
hOW DO ASTRONOMERS MEASURE THE age of the universe?
|
Measure how fast the universe is expanding and work backward. about 13.7 billion years
|
|
|
What are some of the leading hypothesis about the formation of the solar system?
|
1) solar nebula
2) Planetesimals 3) Inner planets 4) Outter planets |
|
|
What theory says a giant cloud of dust and gas collapsed to from our solar system.
|
The Solar Nebula
|
|
|
The theory that says that some planets formed too close to the sun where it was too hot for water and ice forming materials. They escaped the gravity of the forming planets and left the rocky planets.
|
THE INNER PLANETS
|
|
|
Which theory says that small asteroid-like and comet-like bodies are believed to have collided to form planets
|
PANETESIMALS
|
|
|
How do we explain the Outer Planet theory?
|
planets formed where it was cooler and the gases were captured by the forming planets resulting in "gas giants"
|
|
|
What is "DARK MATTER"?
|
what scientiest call the stuff in space between where matter is een. It is infered it exists by observing the effects of its gravity of visible objects
|
|
|
What do some scientist believe about expansion of universe?
|
the univers is expanding and will continue to expand forever
|
|
|
What is "Dark Energy"
|
theunknown force that scientiest thin is the cause of the expansion of the universe
|
|
|
Dark matter and Dark energy are thought to make up ____ of the universe?
|
MOST
|
|
|
iS THE DARK MATTER AND DARK ENERGY FACTUAL
|
NO BECAUSE THERE IS NO DIRECT EVIDENCE
|
