Sun
The process by which the Sun produces energy
Nuclear fusion (hydrogen atoms fusing into helium atoms)
Kepler's First Law states that planetary orbits are this shape
elliptical
Force that holds stars and galaxies together
Gravity
The HR Diagram plots stars on the basis of these two characteristics
Temperature and luminosity
It's acceleration due to gravity
Location of the moon during a solar eclipse
Between the Sun and Earth
the layer of the sun we see
photosphere
In the equation p2=a3, p represents what?
orbital period in Earth years
The hottest stars are this color
blue
Most stars are in this area of the HR diagram
Main sequence
The four types of galaxies
elliptical, spiral, peculiar, and irregular
During the summer solstice in the Northern Hemisphere, the Earth is...
at aphelion and thus moving the slowest
They are cooler than the surrounding areas
Newton's First Law (inertia) states that an object in motion will...
Stay in motion unless acted upon by an outside force
When a massive star collapses and then explodes
supernova
Where the hottest brightest stars are on the HR diagram
top left
Light years and parsecs are units of this
distance
Cause of tides on Earth
gravitational pull of the sun and moon as well as the Earth's rotation
The group of stars the sun is in/ type of star
main sequence
According to Kepler's Laws, a planet will move the slowest in its orbit at this time
When it's at aphelion, or the furthest from the sun
The swirling cloud of gas and dust that is a birthplace of stars
nebula
Where supergiants are on the HR diagram
Top right
The Big Bang theory explains this
Origin and expansion of the universe
Type of tides Earth will have when the moon is either in the first or last/ third quarter position
Neap tides
Layers of the sun in order from inside to outside
Core, radiative zone, convective zone, photosphere, chromosphere, corona
Winter
Reason our sun will never go supernova
It's too small- it is a small/ medium sized star. Only large mass stars go supernova.
The sun is this color star
yellow
Redshift of light from distant galaxies suggests this
The universe is expanding
Equinoxes