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It is possible for particles in space to become so ________ that they form new stars.

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Did you know our solar system is in the Milky Way _________?

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When gas particles _______ in space, they can stick to each other.

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We cannot see them, but there are ________________ at the center of every galaxy.

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When stars _________, they can form black holes.

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My brother was ___________ when he saw a comet for the first time.

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Some people call space a ______________ frontier because there is so much we don't know about it yet.

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A _________ can sometimes be seen through a telescope as a burst of bright light.

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It is amazing that the tiny ____________ of gases in a nebula can combine to form a star.

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Have you ever seen a photo of the _________ where we live?

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Red giants can be formed when stars ___________ , or cave in.

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I never knew that a __________________ had such a strong gravitational pull on the planets around it because of matter collapsing on itself.

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Does the Milky Way Galaxy look like a trail of dust ___________ in space?

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Scientists have not discovered everything in space, which is what makes it so ___________.

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She looked closely at the __________ and wondered if it may contain a black hole.

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When I grow up, I would like to be an _____________.

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Make sure the yarn is wound up tightly so that it is __________ enough to fit in the small container.

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Aren't you ___________ by the thought of travelling to another galaxy?

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The astronaut was careful not to let the asteroid _________ with his spaceship.