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You asked us, where does space begin? Amazingly enough, there isn't an answer to that question. At least not one that's internationally agreed upon and legally binding. Which makes sense, because our atmosphere that thin sheet of air that wraps our planet doesn't end abruptly. It gradually thins out.

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As of Monday, October 24, content that was on TweenTribune.com will now be available here on our new educational resources page and on our learning pages. While much of the content that you enjoyed will still exist, educators will unfortunately no longer be able to assign content to students. Tween Tribune has been a valued educational brand of Smithsonian magazine, and we appreciate your continued support.

Though the Girl Scouts of the USA initially declared itself a space for all girls, the reality was different for girls of color

Erin Blakemore

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As of Monday, October 24, content that was on TweenTribune.com will now be available here on our new educational resources page and on our learning pages. While much of the content that you enjoyed will still exist, educators will unfortunately no longer be able to assign content to students.

# data[].attributes.attachment_link.readable_text
As of Monday, October 24, content that was on TweenTribune.com will now be available here on our new educational resources page and on our learning pages. While much of the content that you enjoyed will still exist, educators will unfortunately no longer be able to assign content to students. Tween Tribune has been a valued educational brand of Smithsonian magazine, and we appreciate your continued support.

Though the Girl Scouts of the USA initially declared itself a space for all girls, the reality was different for girls of color

Erin Blakemore

Get Smithsonian Educational Resources

# data[].attributes.attachment_link.description
As of Monday, October 24, content that was on TweenTribune.com will now be available here on our new educational resources page and on our learning pages. While much of the content that you enjoyed will still exist, educators will unfortunately no longer be able to assign content to students.

# data[].attributes.attachment_link.description
As of Monday, October 24, content that was on TweenTribune.com will now be available here on our new educational resources page and on our learning pages. While much of the content that you enjoyed will still exist, educators will unfortunately no longer be able to assign content to students. Tween…

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Five things that happen to your body in space

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Newsela | The full, blue supermoon is coming to the night sky near you

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Get ready to look up at a very special moon spectacle.

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Newsela | First black astronaut honored on 50th anniversary of death

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Robert Lawrence Jr. would have been the first black astronaut to pilot a space shuttle had he not died in a plane crash in December 1967.

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Newsela | Earth's Atmosphere: A jacket for the planet