Constellations
How to best see constellations?
The best way to see constellations is to go to a rural area.
What are spectral lines?
Spectral lines show if the color spectrum of an object has shifted.
What color of stars are the coldest?
Red stars are the coldest meaning they emit the least energy.
What is absolute magnitude?
Absolute magnitude is the actual brightness of a star not considering its distance from you
What can stars become when they die?
When stars die they either cool and expand (Giant/Supergiant) or shed their outer layers and heat their insides (White dwarf)
What is starhoppping?
To starhop is to find one constellation and locate others from the position of the first one.
How many different types of spectra are there?
There are 3 types of spectra
What color of star is the warmest?
Blue stars are the hottest, they emit the most energy.
What is apparent magnitude?
Apparent magnitude is how bright a star appears from here on earth.
What is the main sequence?
The main sequence is more or less the life path of the stars with them starting at the top being hot blue stars and work their way down to cooler red stars.
Stars that are not constellations?
Asterisms: an example of an asterism would be the big dipper.
What does it mean if the spectra is shifted?
If the spectra shifts to either the left/right it means that the wave frequency has either gone up or gone down. If it goes right the energy goes down if it goes left the energy goes up.
Do gamma rays or radio waves emit more energy?
Gamma rays put out the most energy and have the shortest wave frequency.
In astronomy, is 3 or -3 brighter?
-3 is brighter
What are the different types of stars?
Giant stars, Supergiant stars, main sequence, dwarf stars.
Northern constellation names originated from where?
Northern hemisphere constellation names originated from Greek roots.
Describe the doppler effect?
When something is moving closer to you it gets louder and louder the closer it gets while it gets quieter when they get further away.
What uses do radio waves have in astronomy?
Interstellar clouds emit radio waves and so does cosmic microwave background radiation.
What determines brightness?
Distance and luminosity.
What does the H-R diagram show?
It shows the dispersion of stars on their path in the main sequence.
Who named the 48 constellations?
Ptolemy named all the constellations.
What does the doppler effect change in space?
In space the doppler effect applies to light.
How many objects emit Gamma Rays?
only around 2,000 objects will emit Gamma Rays.
Will stars look brighter closer or further away from us?
The closer the star is to us the brighter it appears, for example the sun appears very bright to us here on earth.
What do the x and y axis represent on the H-R graph?
X axis: temperature of the star
Y axis: luminosity of the star