Extra Exam Knowledge Flashcards
What is the Photosphere?
Surface of a star.
What is the Rock Line?
The snow line.
What is a Standard Ruler?
Physical size is known.
What Happens to the Energy in the Sun’s Core?
Radiation then convective.
What is the Temperature of the Sun’s Core?
16 million degrees Kelvin.
What is the Temperature of the Sun’s Corona?
1 - 2 million degrees Kelvin.
How did we Discover that the Milky Way wasn’t Alone?
Cepheid variables.
Which Celestial Bodies have Crescent Phases?
All planets and the moon.
What Effect does the Greenhouse Effect have on Earth?
Raises temperature by 34 degrees celsius.
How do we use Cepheid Variables to Measure Distance?
Measure period and use it to determine luminosity, use distance modulus equation to compare absolute and apparent magnitude and get a distance.
What is the Significance of a Cepheid Period?
Longer period = larger absolute luminosity.
What are the 4 Steps of Solar System Formation?
1) Large gas cloud collapses into disc
2) Material accumulates at centre
3) Planetesimals are formed
4) Sun begins fusion
What is a Dynamical Family of Asteroids?
Population of asteroid with similar properties, eccentricity, orbital inclination etc.
What Evidence is there that Comets are Loosely Held Together?
They are very small, so don’t have enough gravity to hold a spherical shape.
Who Invented Stellar Classification?
Annie Jump Cannon.
