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Earth and Space Crossword

Across
I am the 5th planet from the sun
I am mostly made up of rock and iron and millions of me travel through earth's atmosphere each day
I am made up of the sun and all the planets, dwarf planets, moons, asteroids, meteoroids, comets, ice, rocks, artificial satellites and space-faring vessels.
I am a star that has exhausted the primary supply of hydrogen fuel at its core.
I am mostly referred to as the northern lights or polar lights. I can look like an orange or red glow on the horizon, like a sunrise or sunset. People sometimes mistaken me for fires.
I am the 4th planet from the sun. Earth and I have the same landmasses.
I am the distance that light travels in empty space in one year.
I am a powerful and luminous stellar explosion.
Down
I am a celestial object consisting of a nucleus of ice and dust and, when near the sun, a ‘tail’ of gas and dust particles pointing away from the sun.
I am a loose mass of cold dust and gasses. When I radiate,I shrink in size to generate the energy that replaces the radiated energy.
I can happen once every 1-2 years. This makes me very rare. I happen when the Moon passes in front of the Sun and casts a shadow across Earth.
I am a massive, gravitational bound system that consists of stars, stellar objects nebulae, an interstellar medium of gas and dust, black holes, and an unknown component of dark matter.
I am the name that scientists use for the most common theory of the universe, from the very early stages to the present day.
I am the coldest planet in the solar system