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The Daily Insight

Is astronaut Mark Kelly a twin?

Author

James Craig

Updated on February 24, 2026

During Scott's stay aboard the space station, scientists were also able to contrast the effects of spaceflight on Scott with his identical twin brother, Mark Kelly, who remained on Earth.

Keeping this in view, are the Kelly twins both astronauts?

Kelly retired from NASA in 2016. His identical twin brother, Mark Kelly, is also a retired astronaut, and the junior U.S. Senator from Arizona.

Also Know, which Kelly twin is in space? Now retired twin astronauts, Scott and Mark Kelly, are subjects of NASA's Twins Study. Scott (right) spent a year in space while Mark (left) stayed on Earth as a control subject.

Hereof, which astronaut has a twin?

Scott and Mark Kelly

Who is Scott Kelly's brother?

Mark Kelly

Related Question Answers

Is Scott Kelly still in space?

In a news conference after the long journey from Kazakhstan to the United States, Kelly expressed enthusiasm for going back to space, but as a part of a private spaceflight instead, as he felt it was time for younger NASA astronauts to get flight assignments. Kelly retired from NASA on April 1, 2016.

Are Mark Kelly's daughters twins?

Mark Edward Kelly (born February 21, 1964) is an American politician, businessman, former astronaut and retired U.S. Navy captain serving as the junior United States Senator from Arizona since 2020. His identical twin Scott Kelly is also a retired astronaut; they are the only siblings to have both traveled in space.

Who is Scott Kelly's wife?

Amiko Kauderer m. 2018 Leslie S. Yandell m. 1992–2010

Do twins live shorter lives?

Twins not only have a bestie from birth — they also live longer than singletons. And those two factors may be related, according to new University of Washington research. Analysis shows that twins have lower mortality rates for both sexes throughout their lifetimes.

Is time shorter in space?

Time is measured differently for the twin who moved through space and the twin who stayed on Earth. The clock in motion will tick more slowly than the clocks we're watching on Earth. If you're able to travel near the speed of light, the effects are much more pronounced.

What happened to Scott Kelly's wife?

Loughner's target was Mark Kelly's wife, Gabrielle Giffords. Loughner killed six people and injured 13 others before he was stopped. Giffords suffered a point-blank gunshot wound to the head and within 38 minutes underwent emergency surgery to save her life.

Do astronauts drop things on earth?

If you drop an apple on Earth, it falls at 1g. If an astronaut on the space station drops an apple, it falls too. That's because they're all falling together: the apple, the astronaut and the station. But they're not falling towards Earth, they're falling around it.

What happens to astronauts bodies when they return to Earth?

In space, astronauts lose fluid volume—including up to 22% of their blood volume. Because it has less blood to pump, the heart will atrophy. Upon return to earth, the blood begins to pool in the lower extremities again, resulting in orthostatic hypotension."

Can your DNA change in space?

Fortunately though, once astronauts return to Earth and are no longer in those same stressful conditions, their DNA expression can change back to much closer to what it was before they went to space. Not all of it changes back though.

Can acceleration be felt in space?

Yes, you can feel acceleration in space, and you can't tell the difference between acceleration and gravity.

What happens to a body in a vacuum?

The vacuum of space will pull the air from your body. Without air in your lungs, blood will stop sending oxygen to your brain. You'll pass out after about 15 seconds. 90 seconds after exposure, you'll die from asphyxiation.

How long is space?

By the same token, space is often defined as beginning at the lowest altitude at which satellites can maintain orbits for a reasonable time – which is approximately 160 kilometers (100 miles) above the surface.

What is time difference in space?

We all measure our experience in space-time differently. That's because space-time isn't flat — it's curved, and it can be warped by matter and energy. So depending on our position and speed, time can appear to move faster or slower to us relative to others in a different part of space-time.

Does space have up and down?

There is an up and down in space. "Down" is simply the direction gravity is pulling you, and "up" is just the opposite direction. Since there is gravity everywhere in space, there is also an up and down everywhere in space. If you are in space and the earth is the nearest astronomical object, you fall towards earth.

Where did Mark Kelly go in space?

the ISS

How does space change your body?

Without the proper diet and exercise routine, astronauts also lose muscle mass in microgravity faster than they would on Earth. Moreover, the fluids in the body shift upward to the head in microgravity, which may put pressure on the eyes and cause vision problems.

Did Mark Kelly go to the ISS?

Mark and Scott Kelly began their astronaut training in August 1996. Mark's first spaceflight was as pilot of the space shuttle Endeavour on the STS-108 mission (December 5–17, 2001), which carried three astronauts and supplies to the International Space Station (ISS).

Is space blindness permanent?

Research performed on the International Space Station shows prolonged time in space can cause temporary, and sometimes permanent, blindness, said the space station's chief scientist recently on “Nevada Newsmakers.” “A few of those astronauts have permanent vision loss that isn't reversed when they turn to Earth.”

How old is Scott Kelly?

57 years (February 21, 1964)

How long does an astronaut stay in space?

six months