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Astronomy Reading 1.5-1.8

Horizontales
The proposed beginning of all space and time
A typical atom is mostly this
Our Local Group of galaxies is part of this Supercluster
The closest large galaxy to the Milky Way
The Universe's most common element
An object which emits its own light
The 88 divisions of the sky used by astronomers
Our closest neighbor in space
Smallest part of an element that retains its properties
The extremely bright centers of distant galaxies
_____System is the Dun, planets, moons, etc.
Collecting more of this is why bigger telescopes are built
Verticales
______Unit, is the distance from Earth to Sun
Distance light travels in one year
Our galaxy is a member of this cluster of about 50 galaxies
A reason aliens would know Earth has intelligent life
______Matter is matter in the Universe invisible to us
A distinguishing feature of Earth
Everything that can be observed
Galaxies were original called _______Universe
The shape of our galaxy
A look into the sky also looks into the _____