PSU ASTRO 7N Exam 2 Questions and Well
detailed Answers Latest Update 2025 Graded
A+.
What color are cooler stars?
Blue
What color are hotter stars?
OBAFGKM
The temperature sequence (from hot to cold) of spectral classes
Alpha Centauri
The closest star to our solar system other than the sun
4.3 light years away
Sirius (Dog Star)
Brightest star in the sky
Red Dwarfs
Which stars are located on the lower right of the HR Diagram?
Cool, faint, small
Blue Giants
Which stars are located on the upper left of the HR Diagram?
Hot, bright, large
Red Giants/Supergiants
Not on the main sequence
Burning helium and other elements in their cores (not hydrogen)
Starting to die
Large and very luminous
, Cooler
Top right of HR DIagram
Stellar nursery, protostar, main sequence, red giant, planetary nebula, white
dwarf
Sun's History
Planetary Nebula
Ejected envelope (the layers of the core) of a low to intermediate mass star
White Dwarf
End state of a star's core
About the size of the Earth
Brown Dwarfs
Failed stars
Don't heat up enough to have nuclear reactions in their core
Onion Skin Model
When a massive star burns through hydrogen and then helium and then more massive
elements it leaves behind layers
Concentric shells of fusion zones involving different chemicals
Iron
Stable element that stops the burning of a star
Type II Supernova
Violent explosion with the star's core left behind
Creates an environment for the fusion of elements heavier than iron to form
Event Horizon
Spherical boundary around a black hole where nothing can escape
Escape velocity of this area is faster than the speed of light
Singularity
detailed Answers Latest Update 2025 Graded
A+.
What color are cooler stars?
Blue
What color are hotter stars?
OBAFGKM
The temperature sequence (from hot to cold) of spectral classes
Alpha Centauri
The closest star to our solar system other than the sun
4.3 light years away
Sirius (Dog Star)
Brightest star in the sky
Red Dwarfs
Which stars are located on the lower right of the HR Diagram?
Cool, faint, small
Blue Giants
Which stars are located on the upper left of the HR Diagram?
Hot, bright, large
Red Giants/Supergiants
Not on the main sequence
Burning helium and other elements in their cores (not hydrogen)
Starting to die
Large and very luminous
, Cooler
Top right of HR DIagram
Stellar nursery, protostar, main sequence, red giant, planetary nebula, white
dwarf
Sun's History
Planetary Nebula
Ejected envelope (the layers of the core) of a low to intermediate mass star
White Dwarf
End state of a star's core
About the size of the Earth
Brown Dwarfs
Failed stars
Don't heat up enough to have nuclear reactions in their core
Onion Skin Model
When a massive star burns through hydrogen and then helium and then more massive
elements it leaves behind layers
Concentric shells of fusion zones involving different chemicals
Iron
Stable element that stops the burning of a star
Type II Supernova
Violent explosion with the star's core left behind
Creates an environment for the fusion of elements heavier than iron to form
Event Horizon
Spherical boundary around a black hole where nothing can escape
Escape velocity of this area is faster than the speed of light
Singularity
