# What is the lightest thing on earth ? **URL:** \ **Category:** Factual Questions\ **Created:** [June 3, 2010, 1:13pm UTC](https://boards.straightdope.com/t/what-is-the-lightest-thing-on-earth/541758 "2010-06-03T13:13:25Z")\ **Posts on this page:** 9\ **Page:** 2
**Author:** ![CalMeacham](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/calmeacham/32/35_2.png) [@CalMeacham](https://boards.straightdope.com/u/CalMeacham)\ **Post date:** [June 3, 2010, 8:07pm UTC](https://boards.straightdope.com/t/what-is-the-lightest-thing-on-earth/541758/21 "2010-06-03T20:07:33Z")
> [@](#): > > I must be missing something here, because ice, at around .9 g/cc, is naturally-occurring, non-spongiform, and lighter than any of those. Good point. I was looking for things at room temperature that weren’t “blown up” with air\*. but ice is close enough to room temperature for most people’s purposes. \*like pumice and aerogels ---
**Author:** ![tattman40](https://avatars.discourse-cdn.com/v4/letter/t/db5fbb/32.png) [@tattman40](https://boards.straightdope.com/u/tattman40)\ **Post date:** [June 4, 2010, 12:36am UTC](https://boards.straightdope.com/t/what-is-the-lightest-thing-on-earth/541758/22 "2010-06-04T00:36:25Z")
My wallet. ---
**Author:** ![Triskadecamus](https://avatars.discourse-cdn.com/v4/letter/t/b19c9b/32.png) [@Triskadecamus](https://boards.straightdope.com/u/Triskadecamus)\ **Post date:** [June 4, 2010, 4:47am UTC](https://boards.straightdope.com/t/what-is-the-lightest-thing-on-earth/541758/23 "2010-06-04T04:47:47Z")
There are some who feel that certain opinions have great substance. (Generally, they mean their own opinions, or at least those opinions with which they agree.) Casual conversation is, at times referred to as light discourse, so it would be lighter than other, more weighty matters. I know that often even things left unsaid can weigh heavily upon one. Not to mention heavy emotional burdens, and even the opposite case of uplifting news. Tris ---
**Author:** ![Mosier](https://avatars.discourse-cdn.com/v4/letter/m/7ea924/32.png) [@Mosier](https://boards.straightdope.com/u/Mosier)\ **Post date:** [June 4, 2010, 9:16am UTC](https://boards.straightdope.com/t/what-is-the-lightest-thing-on-earth/541758/24 "2010-06-04T09:16:07Z")
Do we even know for sure if gravitons exist? ---
**Author:** ![chorpler](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/chorpler/32/2888_2.png) [@chorpler](https://boards.straightdope.com/u/chorpler)\ **Post date:** [June 4, 2010, 3:37pm UTC](https://boards.straightdope.com/t/what-is-the-lightest-thing-on-earth/541758/25 "2010-06-04T15:37:08Z")
> [@Napier](#): > > Different gases can be permeated into or out of the aerogel, though it might be pretty slow. Better than hydrogen is vacuum. A vacuum-baked aerogel takes a while to refill itself when returned to the air, and meanwhile it can be light enough to float up to the ceiling like a balloon. And it’s strong enough to not just collapse under the air pressure? That’s awesome. ---
**Author:** ![Chronos](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/chronos/32/134_2.png) [@Chronos](https://boards.straightdope.com/u/Chronos)\ **Post date:** [June 4, 2010, 8:23pm UTC](https://boards.straightdope.com/t/what-is-the-lightest-thing-on-earth/541758/26 "2010-06-04T20:23:48Z")
> [@](#): > > Do we even know for sure if gravitons exist? They almost certainly exist, and we know a few of their properties, but we never have and probably never will observe individual gravitons, and we know very little about how they interact with other particles. ---
**Author:** ![YogSothoth](https://avatars.discourse-cdn.com/v4/letter/y/8edcca/32.png) [@YogSothoth](https://boards.straightdope.com/u/YogSothoth)\ **Post date:** [June 4, 2010, 11:05pm UTC](https://boards.straightdope.com/t/what-is-the-lightest-thing-on-earth/541758/27 "2010-06-04T23:05:02Z")
Heidi Klum ---
**Author:** ![beowulff](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/beowulff/32/542_2.png) [@beowulff](https://boards.straightdope.com/u/beowulff)\ **Post date:** [July 6, 2017, 2:35am UTC](https://boards.straightdope.com/t/what-is-the-lightest-thing-on-earth/541758/29 "2017-07-06T02:35:46Z")
> [@mariasam](#): > > If you are looking for the lightest thing on earth, maybe you can get some ideas from [http://www.samaterials.com/](http://www.samaterials.com/) Reported. ---
**Author:** ![Ethilrist](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/ethilrist/32/4604_2.png) [@Ethilrist](https://boards.straightdope.com/u/Ethilrist)\ **Post date:** [July 6, 2017, 2:52am UTC](https://boards.straightdope.com/t/what-is-the-lightest-thing-on-earth/541758/30 "2017-07-06T02:52:18Z")
Ew. Zombie spam. [Previous page](https://boards.straightdope.com/t/what-is-the-lightest-thing-on-earth/541758.md?page=1)