Updated for Wednesday at 11 a.m. ET: About one day after the original tweet misidentifying the moon as the sun was sent, NASA issued a correction stating that the bright object in Scott Kelly's photo is the moon and not the sun. The space agency has since deleted the original tweet, but a screenshot is embedded below.

Oh, NASA. That is not a picture of the sun from the International Space Station.

That's a picture of the moon.

On Tuesday, NASA's official Twitter account, which boasts 12.1 million followers, posted a photo taken by NASA astronaut and current year-long Space Station resident Scott Kelly claiming that the sun and Earth can both be seen in the image.

See also: 55 Astonishing Images of Earth From Space

The original tweet sent by NASA misidentifying the moon as the sun.

However, some intrepid space fans on Twitter, including this reporter, pointed out that the bright shining object in the photo is not the sun, but is, in fact, the moon.

NASA has since deleted the tweet and issued a correction, but a screenshot of the tweet is embedded above.

@NASA If that were the sun, we wouldn’t be seeing the stars around it, right? Unless you’ve invented a completely new kind of camera. — Michael Howard (@mmbman) September 8, 2015

"Well, seeing as how stars and city lights at night are both visible in the field of view with the bright light source, it can't possibly be the sun," Emily Lakdawalla, planetary scientist and senior editor of The Planetary Society, told Mashable via Twitter DM.

This isn't the first time this has happened, either. NASA also confused the moon and the sun in another photo Kelly posted to Twitter earlier this summer. The space agency mislabeled the moon as the sun while the Space Station flew above the western United States.

It can be confusing to identify the sun versus the moon when seen in a photo taken from the Space Station, but one clear indicator of which is which are the stars in the sky seen surrounding the bright object.

Basically, when the sun is out, you likely won't be able to see any stars (even when hurtling through space), but when the moon is out, astronauts can likely see a multitude of stars in the sky.

The moon might look particularly star-like in these images because of the photo's long exposure.

But hey, it's alright, NASA. We all make mistakes. Especially on social media.