Phases of the Moon
Sun, Earth, Moon
The Solar System
The Universe
Space Exploration
100
This phase of the moon is used to describe the time when the side of the moon facing earth is mostly in shadow.
What is a crescent moon?
100
These oceanic rhythms are determined primarily by the moon.
What are tides?
100
These four planets are commonly know by the monikers "The Terrestrial Planets" or "The Inner Planets".
What are Mercury, Venus, Earth, and Mars.
100
This measure of distance describes how far light travels through a vacuum in one year.
What is a lightyear?
100
These optical instruments are used to magnify and brighten extremely distant space objects.
What is a telescope?
200
This term is used to describe when the illumination of the moon is increasing.
What is waxing?
200
This rare celestial event occurs only when the moon sits perfectly between the earth and the sun.
What is a solar eclipse?
200
These celestial objects are made primarily of ice and rock and have extremely elliptical orbits, meaning they are only visible from Earth on extremely rare occasions.
What are comets?
200
This celestial formation of millions of stars held together by gravity has a supermassive black hole at the center.
What is a galaxy?
200
This probe is the most distant manmade object from Earth.
What is Voyager one?
300
This phase of the moon occurs when the moon is directly between the earth and sun. It also signals the beginning of a new month.
What is a new moon?
300
Tides happen every day, but some days' tides are more extreme than others. The extreme tides are caused by the alignment of these three celestial bodies.
What are the earth, moon, and sun?
300
This collection of millions of small rocky objects serves as the boundary between the inner planets and the outer planets.
What is the asteroid belt?
300
This word describes a spherical object that has cleared its orbit and orbits a star other than the sun.
What is an exoplanet?
300
This substance that defines the "habitable zone" of exoplanets is also assumed to have been essential in the evolution of life on Earth.
What is liquid water?
400
This phase of the moon is often seen during the day and occurs early in the month.
What is a waxing crescent moon?
400
This relatively common celestial event happens only when the moon sits on the perfectly opposite side of the earth from the sun.
What is a lunar eclipse?
400
This region of space is where Pluto resides and exists outside the orbit of Neptune, the most distant planet in the solar system.
What is the Kuiper Belt?
400
This term for the collection of galaxies near the Milky Way is a proper noun.
What is the Local Group?
400
This series of space missions endeavored and succeeded in landing on the moon in 1969.
What are the Apollo missions?
500
This phase of the moon is seen mostly during the night and occurs in the second half of the month.
What is a waning gibbous moon.
500
The view of the moon from the earth is always the same, otherwise known as being tidally locked, meaning that the moon rotates this many times per Earth year.
What is twelve?
500
If these three descriptions of an object are true, it will be defined as a planet.
What are it orbits the sun, it is spherical, and it has cleared its orbit?
500
This collection of hundreds of thousands of galaxies is the largest order of organization we are able to describe in the universe.
What is a supercluster?
500
This profound implication of discovering life on Mars is one of the primary reasons we are searching for it.
If life evolved on Mars, life in the universe is likely to be extremely common.