2.6
in red super giants, hydrogen fuses into this
what is helium
a good place for infrared telescopes
what are mountain tops
the study of the universe
what is astronomy
measurement in space and is equal to 93 million miles
the third planet from the sun
what is the Earth
extremely dense objects with gravity so strong that light cannot escape
what are black holes
heat transfer in the sun
what is convection
the total amount of matter in an object and does not change with location
what is mass
these planets can pass in front of the sun via transit
what are Mercury and Venus
eccentricity falls between these 2 numbers
what is 0 and 1
matter gains energy from this
what is heat
the part of the sun visible only during a total eclipse
what is the corona
the 2 planets where the asteroid belt is located between
what is Mars and Jupiter
this star is powered by the fusion of hydrogen into helium
what is the sun
if eccentricity becomes 0, then the orbit becomes this shape
what is a perfect circle
astronomers use these to measure wave lengths of light
what is a spectrometer
two objects first considered when studying dark mater
dust and dead stars
this planet has the shortest orbital period because it is closest to the sun
what is Mercury
what is perihelion
this astronomer discovered that planets move in elliptical orbits
who is Johannes Kepler
energy emitted as waves or particles in known as this
what is radiation
energy producing matter that is not visible to the human eye
what is dark matter
the only 2 planets without moons
what are Mercury and Venus
the point when a planet is farthest from the sun
what is aphelion
The formula for this vocab term is E = d / L
what is eccentricity