Planets, Stars, Galaxies and Scientists Crossword

Developed a geocentric model trying to explain planet's backward motion
Developed a math formula to explain gravity
An oval shaped orbit
An interstellar gas cloud
condense objects ranging from 1km to 100km orbiting early forming stars (baby planets)
The apparent backward motion of the planets as viewed from Earth
the average distance from the earth to the sun
The person who developed the laws of planetary motion
How close to a circle an oval is?
A Hollywood havenly body
The force of that pulls large objects in space towards one another
As of 2018 considered the smallest planet
Earth's evil twin
Called 'The Blue Planet'
Used a telescope to look at the Planets and discovered Jupiter has moons
Call the 'red planet'
The largest gas giant
The ring planet
The sideways planet
To spin upon an axis
This planet was discovered in 1846
pluto is now a
The largest object in the asteroid belt
The star in our system
Two stars bound together by gravity
imaginary grouping of stars in a pattern
Large grouping of stars
The name of our galaxy
An exploding massive star
An extremely dense core of a massive star that light can not escape