Astronomers and other scientists constantly research and explore space. One of the most intriguing questions they hope to answer one day is whether life exists on other planets. Despite a lot of research in outer space, scientists have not yet been able to find evidence of life forms on any other planet other than Earth.

Earth is very hospitable, which makes living here easy. Earth has water, which living creatures need to survive.

Earth also has an atmosphere that is neither too hot, nor too cold. Its distance from the sun provides Earth’s inhabitants with the proper amount of warmth, sunlight and energy.

Although there may be other planets that have some of Earth’s hospitable features, so far scientists have not found any with all of the features they believe necessary to sustain life. Earth remains one of a kind!


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    • There are lots of Wonder Friends out there who WONDER the same thing, Jon! Thank you for sharing your thoughts about aliens and THANK YOU for visiting Wonderopolis! :-)

    • Maybe they’re not an advanced civilization. They proboably live in the other corner of the Galaxy and don’t have the technology to make it here themselves, they might even ask if they’re the only planet with life as well or they know if there’s more planets with life near them.

      • Thanks for sharing these great ideas, Erick! A lot of our Wonder Friends have asked if there might be other life forms in the universe that wonder about life on other planets. Do you think we’ll ever know? Maybe when we find them, or they find us on Earth?

      • Thank you for spending time WONDERing about life on other planets today, Bailey. We appreciate you sharing your thinking with us. We hope you have a WONDERful Wednesday! :)

        • Thank you for sharing your comment with us, Jake! That’s a good point — life may have existed, we just haven’t found it yet! :)

    • What a great question, Mark! We are so proud of all the WONDERing you have been doing! While we can’t be certain about life on Mars, we are having a great time exploring and learning about all the evidence that has been found! What do you think? :)

  1. I think there are aliens, but I think they’re going on with their lives and not too worried about us as humans invading them. They are definitely not interested in probing us. Let it go, we may find them some day. Stop worrying about them invading us. THEY’RE NOT GOING TO!

  2. The universe is way too large for us to be the only life form out there. But due to the vast distances and space we will most likely never have any communication with another being.

    • We don’t know if we would want to see them or not, Cardarrell. They could be scary! Thanks for WONDERing with us today! :-)

    • Great question, Brianna! As you go higher, and higher into the Earth’s atmosphere the air does get thinner. Yet, when you get past our atmosphere there is little to no air. Space is kind of like a vacuum. Weird, huh? Thanks for WONDERing with us today! :-)

  3. Everything that CAN happen, given sufficient opportunity, WILL happen. There are probably more than 170 billion galaxies in the observable Universe.
    The Milky Way contains up to 400 billion stars of various sizes and brightness. If you multiply the number of stars in our galaxy by the number of galaxies in the Universe, you get about 1,000,000,000,000,000,000,000,000 stars. That’s a septillion stars. It is enough for me to proclaim with absolute certainty that since it can happen, and there is sufficient opportunity for it to happen, there IS life on other planets! Although there is no proof of it yet.

    • WOW, that’s pretty amazing to think about! Thanks for sharing this with us today, Lord Kiltridge! :-)

    • Thank you for sharing your thinking with us today, Wonder Friend Kayla. We hope you WONDER with us again soon! :)

  4. I request that the video was more based on the aliens, not the lander. It doesn’t give us much to think about. Thanks!

    • We’re sorry the video didn’t appeal to you, Bobby. We appreciate you stopping by Wonderopolis and leaving a comment today. :)

    • Hey, Gabriel! Scientists continue to search for life on Mars but haven’t found it yet. However, some scientists suspect there may have been life a very, very long time ago! :)

  5. yes, of course there is people living on other planet . may be people living in stars too . i am searching from last 25 years , is that sky has a limit . i found answer yes it has a limit or end . people could not found it yet because sky is round like ball. many past decades people believe that earth has no end . asain believes that they are only people on earth and left is only ocean which has no end . the people of united state and african , european believe they same things . even a small islander people like sychelles belief the same thing but later the find that earth have a end it is round . same like earth sky is round . i have proof of that . same like us we believe that we are only one on earth and people who lives in stars think same like us that they are only ones on other planet .

  6. Life on other planets is just proposterouse. think about it. how far is the nearest star.. 4 light years and also traveling at light speed is immpossible without your ship desentergrading and what ever little space dust left of you floating in space because of the force.

  7. Life exists at other planet, well I am not joking, I am serious; Life on earth is visible to you because earth life form can see each other. Likewise, other planet life form can see each other. It is like you are in a close box all you can see is darkness. Since, on and in earth is filled up of spherical matter, so I assume the box you are in is spherical….

    • Hi, Rj! Thanks for sharing your thoughts with us! So far scientists have not been able to prove there is life on other planets. Maybe one day! Have a WONDERful day! :)

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Have you ever wondered…

  • Is there life on other planets?
  • What must a planet have in order to sustain life?
  • What would you want an alien life form to know about Earth?

Wonder Gallery

Try It Out

Imagine astronomers have discovered friendly beings on a distant planet called Wondertron. They would like to send a “welcome package” from Earth to the residents of Wondertron, and you have been recruited as a representative of America to help decide what to send.

The welcome package should include:

  • Three items that represent modern life in America
  • Three news stories about important moments in American history
  • Three foods that represent American culture
  • Three miscellaneous items of your choice
  • Three descriptions of unique Earthling habits (examples: birthday parties, spelling bees, having pets, collecting seashells, dancing, parades, building snowmen)

What would your welcome package contain? Write a brief description of what you would send to the aliens of Wondertron.

Since you can’t send a package to Wondertron, instead email your description or send a copy to Wonderopolis:

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325 West Main Street, Suite 300
Louisville, KY 40202-4237


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