Uh oh, B.o.b., you're in trouble now.
Everyone's favorite science-explaining astrophysicist, Neil deGrasse Tyson, posted a series of tweets directed at the rapper after he very publicly announced that he believes the Earth is flat on Monday.
Tyson went through a couple of B.o.b.'s tweets, refuting his claims with hard science.
@bobatl Polaris is gone by 1.5 deg S. Latitude. You’ve never been south of Earth’s Equator, or if so, you've never looked up.— Neil deGrasse Tyson (@neiltyson) January 25, 2016
@bobatl Earth's curve indeed blocks 150 (not 170) ft of Manhattan. But most buildings in midtown are waaay taller than that.— Neil deGrasse Tyson (@neiltyson) January 25, 2016
Tyson also couldn't help but get a dig or two in where he could.
@bobatl Flat Earth is a problem only when people in charge think that way. No law stops you from regressively basking in it.— Neil deGrasse Tyson (@neiltyson) January 25, 2016
There are actually plenty of scientific arguments that show the Earth is round -- or an "oblate spheroid," technically.
First of all, astronauts and spacecraft have actually seen the shape and movement of the Earth from various parts of space. The residents of the International Space Station, for example, send back plenty of photos and videos showing the curved limb of the planet seen through the windows of the station. There are even live camera views from the Space Station showing the curvature.
Apollo astronauts also saw spherical Earth from the moon during missions to the lunar surface.
And if that weren't enough, there is a spacecraft called the Deep Space Climate Observatory, also known as DISCOVR, located 1 million miles from Earth taking photos of the entire sunlit side of the planet multiple times a day that show the world's shape and rotation. (You can click through some of the photos from NASA.)
Of course, just because B.o.b. thinks the Earth is flat doesn't mean Tyson isn't a fan of the rapper.
@bobatl Duude — to be clear: Being five centuries regressed in your reasoning doesn’t mean we all can’t still like your music— Neil deGrasse Tyson (@neiltyson) January 25, 2016
It remains to be seen whether that fandom will continue, however, since B.o.b. just released a diss track called "Flatline" calling out Tyson. The track quotes Tyson at length, in his own voice, before saying, "Flatline, you've fooled us for the last time."