# If the earth was a black hole how big would it be in diameter **URL:** \ **Category:** Factual Questions\ **Created:** [October 26, 2013, 11:41pm UTC](https://boards.straightdope.com/t/if-the-earth-was-a-black-hole-how-big-would-it-be-in-diameter/672339 "2013-10-26T23:41:45Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Wesley\_Clark](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/wesley_clark/32/20581_2.png) [@Wesley\_Clark](https://boards.straightdope.com/u/Wesley_Clark)\ **Post date:** [October 26, 2013, 11:41pm UTC](https://boards.straightdope.com/t/if-the-earth-was-a-black-hole-how-big-would-it-be-in-diameter/672339/1 "2013-10-26T23:41:45Z")
What about the sun? ---
**Author:** ![Xema](https://avatars.discourse-cdn.com/v4/letter/x/9de053/32.png) [@Xema](https://boards.straightdope.com/u/Xema)\ **Post date:** [October 26, 2013, 11:57pm UTC](https://boards.straightdope.com/t/if-the-earth-was-a-black-hole-how-big-would-it-be-in-diameter/672339/2 "2013-10-26T23:57:51Z")
According to [this calculator](http://hyperphysics.phy-astr.gsu.edu/hbase/astro/blkhol.html): The Schwarzschild radius for an object with the mass of the Earth is around 8.8 mm. For an object with the mass of our Sun, it’s 2.9 km. ---
**Author:** ![Cerealbox](https://avatars.discourse-cdn.com/v4/letter/c/7ab992/32.png) [@Cerealbox](https://boards.straightdope.com/u/Cerealbox)\ **Post date:** [October 27, 2013, 12:26am UTC](https://boards.straightdope.com/t/if-the-earth-was-a-black-hole-how-big-would-it-be-in-diameter/672339/3 "2013-10-27T00:26:44Z")
> [@Xema](#): > > According to [this calculator](http://hyperphysics.phy-astr.gsu.edu/hbase/astro/blkhol.html): > > The Schwarzschild radius for an object with the mass of the Earth is around 8.8 mm. > > For an object with the mass of our Sun, it’s 2.9 km. Damn. That is one interesting stat.