6.2-6.5 Digital Lesson Flashcards
Solar system that contains one, two, or more then 2 stars
One: single star
Two: binary star system
More then 2: multiple star systems
Since stars are made up of gas they have structure
True
Once nuclear fusion begins, what do stars emit
Visible light and other forms of energy
When stars form during the early part of their life cycle, what is blown away
Dust and clouds
What takes place in the core of a star for most of its life cycle
Fusion
Nuclear fusion
When the atoms come together
Nuclear fission
The separating of atoms
Planetary nebulae
Expanding shells of gasses
Exposed core of a star
White dwarf
White dwarfs increase luminosity as they age
False
Black hole
When the core of a supergiant star collapses. Forms a black hole if it had a large mass
Coolest stars
Red dwarfs
Can infrared radiation be seen with the naked eye
No
How can electromagnetic waves be described
Wavelength, frequency, and energy
Energy is the ability to do
Work
A higher frequency means a _________ wavelength. A lower frequency means a __________ wavelength
Shorter;higher
Can EM waves carry light
Yes
Can all EM waves travel at the same speed
Yes
Can wavelength determine the type of radiation for an EM wave
Yes
Is visible light the only type of EM wave that humans can see
Yea
Does earths atmosphere not absorb dangerous gamma waves from space
No
Continuous spectrum
Unbroken band of color that shows that it’s source is emitting light of all visible wavelengths
Emission spectrum
Series of unevenly spaced lines of color and brightness which show that the light source is emoting only certain wavelengths
Absorption spectrum
Continuous spectrum crossed by dark lines
The dark lines on and absorption spectrum are formed when light from a glowing object passes through a cooler which absorbs some of the wave links
True
Can scientists use the absorption spectrum to identify the gas with an object
Yes
Can only soundwaves experience the Doppler effect
No
EM wave that shows hot objects and black holes
X Ray
Reflecting telescope
Uses mirrors to contract a visible light
Refracting telescopes
Uses lenses to concentrate visible light
What is the unit to measure the size of a star
Solar radii
How many states make up a star cluster
Hundreds or even thousands
Example of a star cluster
Omega Centauri
When did the Hubble telescope begin sending pics to earth
1990
How old is our universe estimated to be
13 billion years old
How are stars held together
In galaxies
How many galaxies in a galaxy cluster
Dozens
Knowing ages of stats helps scientists estimate what
Age of universe
Do all stars in a star cluster form at the same time
Yeah
What were newtons thoughts about the universe
He thought it was unchanging and he thought stars were evenly scattered in the universe and could not change position
Einsteins equations told him that the universe was
Changing and expanding
What did Hubble observe that is considered evidence for the expanding universe
Red shifts
What year was CMB first detected
1960s
What 2 things do scientists compare to find the age of the universe
They use current rates of expansion to estimate past rates of expanison
Hubble constant
Rate at which the universe is expanding
3 things that support the Big Bang theory
- Traces of CMB
- Expanison of universe
- Red shifts
Galaxies moving away from the Milky Way are
Red shift
Galaxy moving toward earth
Blue shift
Within the spectrum of the electromagnetic spectrum visible light
Red light has the longest wavelength and violet light has the shortest wavelength
By analyzing the spectra of galaxies what did astronomers discover
The most distant galaxies are moving are moving apart faster then closer galaxies
How do astromers learn about a stars composition
The colors and lines on a stars electromagnetic spectrum indicate which substances are present in the stars outer layers
What did they discover That indicates that distant galaxies are moving apart
Light from distant galaxies is stretched in longer wavelengths
How did the discovery that galaxies are moving farther apart help scientistists conclude that all matter was once merged together
It is based on the logic that things moving away from each other must have been close together before
