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These Twins Prove That Being An Astronaut Doesn’t Stop A Sibling Rivalry

They may be astronauts, but they are also siblings.

Posted on November 16, 2015, at 5:06 p.m. ET

Here are Mark and Scott Kelly. Scott is an astronaut currently spending a year in space. Mark is a former astronaut here on Earth. They are twins.

Robert Markowitz / NASA

Mark is on the left, Scott is on the right. The fact that they are twins is super helpful to NASA, who will use Mark as a control while his identical twin brother experiences space for a year, giving scientists insight into what being in zero-gravity for long periods of time does to a human.

In rare instances, their Twitter accounts are proof that neither is above some gentle smack talk between brothers, even when one of them is in space:

Marco Grob / NASA / Via

1. There was that time that Scott was reminded of brotherly "punch-ups" from their youth by a promotional poster:

2. And there was a time when Mark expressed sympathy for the astronauts joining Scott on the International Space Station:

3. Or that time that Mark kindly reminded Scott that his coffee contained recycled urine:

4. Once, Scott used his high vantage point to give Mark a hard time about his loss to Aaron Rodgers on Celebrity Jeopardy:

5. But Mark has been quick to remind Scott of the joys of being on safely on land:

6. Backhanded compliments are a must when dealing with astronaut brothers:

7. In fact, Mark has repeatedly expressed mild concern over Scott's ability to not break things:

8. And there was that time when Scott was unimpressed with Mark's blood-drawing struggles:

9. They may be twins, but according to Scott, sympathy pains are not a given:

10. Despite all the gentle ribbing, though, they both know where they stand with each other:

Typical brothers. Minus the astronaut part...

Kirill Kudryavtsev / AFP / Getty Images