Celestial Sphere
A collection of millions or billions of stars, bounded together by gravity.
What is a galaxy?
This historic figure developed three laws which describe the motion of the planets.
Who is Johannes Kepler?
A law that describes how the net force of an object equals the object's mass multiplied by its acceleration.
What is Newton's Second Law?
To our eyes, hotter objects appear more like this color.
What is blue?
The source of materials that become the building blocks for planets.
What is a nebula?
The Earth's 23.5 degree axial tilt is the angle between Earth's rotation axis and ________.
What is the ecliptic plane?
A model designed to explain what we see in the night sky while having the Earth orbit the Sun.
What is the heliocentric model?
A measurable property of an object that does not change over time.
What is a conserved quantity?
The spectra of most galaxies show redshifts, meaning that their spectral lines have wavelengths that are ________ than normal.
What is longer?
The region of the Solar System where Ceres is found.
What is the Asteroid Belt?
A star that always lies above your local horizon.
What is a circumpolar star?
A model based on natural processes whose predictions explain a wide variety of observed phenomenon.
What is a scientific theory?
________ are responsible for the Moon always showing the same face to the Earth.
What are tides?
We put some telescopes into space because some wavelengths are completely absorbed by the Earth's ________.
What is atmosphere?
Smaller bodies lose heat faster because they have a relatively large ________ compared to their volume.
What is surface area?
The season experienced in the Southern Hemisphere when the Northern Hemisphere is tilted towards the Sun.
What is winter?
For most of history, the lack of observable stellar ________ was interpreted to mean that the Earth was stationary at the center of the Universe.
What is parallax?
An object in an orbit that is ________ around the Sun means that it will approach the Sun once and then never return.
What is unbound?
We observe this type of spectrum when we look at a star with an intervening cloud of cool gas.
What is an absorption spectrum?
Planets emit most of their light in this wavelength range.
A New Moon rises approximately at this time of day.
What is sunrise?
The great contribution of ________ was to create a detailed model of our Solar System with the Sun at the center.
Who is Nicolaus Copernicus?
Earth is farthest from the Sun in July and closest to the Sun in January, meaning that Earth moves slowest in the Northern Hemisphere's season of ________.
What is Summer?
This property of a telescope provides it with more light collecting area and a better angular resolution.
What is diameter?
This feature on Earth plays a key role in the CO2 cycle by allowing for the storage of CO2 within the Earth's mantle.
What are plate tectonics?