Luminosity
How bright the star appears to us on Earth
What is apparent magnitude?
OBAFGKM
What is the spectral classification for stars?
What is nebula?
The first elements that formed in the universe
What is hydrogen and helium?
L = 4*pi*R^2*s*T^4
What is the equation of a star's luminosity?
G2 is the spectral classification of a very, very, very close star.
What is the Sun?
The final stage in the life-cycle of the most massive stars. The gravity around these is so strong that light cannot escape.
What is a black hole?
Heavier elements form when these stars die
What are red supergiants?
The constant used in the Luminosity equation
What is the Stefan-Boltzmann constant? (5.670374419 × 10−8 (W / m2 x K4)
These stars have low luminosity, size, and mass
What are white dwarfs?
These hot stars have more mass than stars like our Sun, and shorter life cycles than lower mass stars.
What is a blue giant star?
hydrogen atoms coming together to create energy and helium
What is nuclear fusion?
Flux = L / (4*pi*d^2). This describes what type of brightness for stars?
What is an expression for a stars apparent brightness?
Spectral types of giant stars
What are types G, K, M?
This color star is the youngest.
What is the blue star?
When gas and dust form together in a clump, but it is not hot enough to start fusion.
What is a protostar?
opposing forces that hold together a star
What is nuclear fusion and gravity?
The James Webb Telescope could measure light from this undiscoverable time.
What is the Big Bang?
The least abundant star in the main sequence
What is type O star?
The location of Betelgeuse a red giant star in the HR diagram
What is the upper right corner?
Explosion expands this dying star, and also compresses into a tiny celestial object.
What is a supernova remnant and neutron star?
This "star" is not hot enough to fuse hydrogen in its core.
What is a brown dwarf?