Space, Universe and Milkyway Crossword

A system of billions of stars with gas and dust, held by gravitational attraction.
The spiral shaped galaxy we live in.
All existing matter and space
The rapid expansion of matter, marked the origin of the universe
An Italian physicist and astronomer who discover four of Jupiter's moons
An American astronomer who proved the existence of other galaxies beside ours.
a cosmic structure containing 100 other galaxy clusters as well as the Milkyway
Space is a _________
Earth is the ______ closest planet to the sun.
The vast 3-dimensional region that begins where the earth's atmosphere ends.
What would be located at the galactic centre of the Milky Way?
The __________ is part of the bigger collection of galaxies, the Virgo Supercluster