The Milky Way Times Crossword

As of 2006, _____ is no longer classified as a planet.
It is the closest planet to the sun.
A huge star in the centre of our solar system.
The biggest planet.
It takes the earth 365 days to _____ the sun.
This planet rotates on its side.
Someone who goes into space.
A red planet ; humans have sent robots there.
A _____ is a small chunk of dust and ice that orbits, or travels around, the sun. it is sometimes described as a dirty snowball.
Neil Armstrong was the first person to walk on the ____.
The force that pulls you towards the centre of a planet or star.
How many planets are there?
Fits some criteria for a planet but not all.
The name of our galaxy.
The hottest planet in our solar system.