Definitions
Our Solar System
H-R Diagram
Star Life Cycles
Habitability
200
These are any planet outside our Solar System
What is an exoplanet?
200
Planets further from the Sun than Earth tend to hold water in this form
What is ice?
200
According to the H-R Diagram, stars Procyon B and Sirius B are this type of star
What are White Dwarf stars?
200
When stars get smaller and more dense, this force is responsible
What is gravity?
200
This is the only planet in our Solar System's habitable zone
What is Earth?
400
This dust-covered, icy object has a highly elliptical orbit
What is a comet?
400
One day on this planet takes longer than one year there!
What is Venus?
400
Stars with greater luminosity tend to have this type of mass (compared to our Sun)
What is greater/heavier?
400
All stars are born from a cloud of dust called a "star-forming ________"
What is a nebula?
400
This "shield" of gas protects us on Earth from the more harmful radiation from our Sun
What is the atmosphere?
600
When this value is close to 0, the orbit is closer to a perfect circle.
When it is closer to 1, the orbit is more oval-shaped.
What is eccentricity?
600
Since fusion force and gravity are in equilibrium on it, our Sun is said to be in this condition
What is stable?
600
Tau Ceti, our Sun, and Alpha Centauri A are all this color stars
What is yellow?
600
After billions of years, a Sun-like star will enter this intermediate stage
What is a Red Giant star?
600
The possibility of THIS existing on a planet is what determines if it is habitable
What is water?
800
In stars like our Sun, hydrogen combines with more hydrogen to produce helium and energy through this force
What is nuclear fusion?
800
The arrangement of celestial objects in our Solar System is best described by this model
What is the heliocentric model?
800
This star has a measured temperature close to 10,000 K and a luminosity of 102 solar units
What is Vega?
800
After this end-of-life explosion, a star may become a black hole, neutron star, or start the life cycle over
What is a supernova?
800
With current technology, humans cannot reach potentially habitable exoplanets because they are all this far away
What are lightyears?
1000
Scientists can tell what elements a star emits based on these graphs
What are emission spectra?
1000
Scientists believe our Sun and Solar System to be this old
What is 4.6 billion years?
1000
Stars of this spectral class tend to be blue or blue-white in color
What is O?
1000
This characteristic of a main sequence star determines whether it will go Giant or Supergiant
What is its mass?
1000
This form of life showed up around 2.8 billion years after Earth's first oceans formed
What is multicellular life?