One of America's most prominent heroes, Neil Armstrong, has passed away at the age of 82. The legendary American astronaut known for making "one small step for man, one giant leap for mankind," as the first man EVER to walk on the moon, died on Saturday after suffering complications from cardiovascular procedures.

Armstrong was the commander of the Apollo 11 spacecraft, the first spacecraft to land on the moon. He was also the first man to exit the craft and step foot on the moon, a moment we described to an Australian TV interview earlier this year, saying, "It was special and memorable, but it was only instantaneous because there was work to do." Armstrong and his fellow astronaut Buzz Aldrin walked around the moon for just about 3 hours, taking photographs, gathering samples of moon rocks and other lunar materials and doing experiments.

"As long as there are history books, Neil Armstrong will be included in them. As we enter this next era of space exploration, we do so standing on the shoulders of Neil Armstrong. We mourn the passing of a friend, fellow astronaut and true American hero," NASA administrator Charles Bolden stated of the astronaut's passing. Shortly after the news of Armstrong's death broke, the celebrities took to their Twitter accounts to express their condolences.

Here's what they had to share:

Snoop Dog: "RIP to my Unk Neil Armstrong! Stay High."

Ryan Seacrest: "Thanks Neil Armstrong for bringing the moon into our living rooms & curiosity into our minds. One giant loss for mankind."

Sir Richard Branson: "RIP Neil Armstrong. My first inspiration to try to make space travel possible for all. A hero for anyone who looks to the stars & dreams.

Josh Duhamel: "One of our greatest heros died today. RIP Neil Armstrong."

Barack Obama: "Neil Armstrong was a hero not just of his time, but of all time. Thank you, Neil, for showing us the powe r of one small step. -bo."

Olivia Munn: "RIP Neil Armstrong. Thank you for taking the first step for us..."

MellyJHart: "RIP Neil Armstrong! We have lost a true hero and pioneer! Than you for being an example of brains and bravery!"

TheMandyMoore: "RIP, Neil Armstrong.... a Hero who changed History."

Gary Sinise: "Will never forget "One small step for man. One giant leap for mankind." God bless Neil Armstrong. A great inspiration and American hero. R.I.P."

The Armstrong family released the following statement:

"We are heartbroken to share the news that Neil Armstrong has passed away following complications resulting from cardiovascular procedures. While we mourn the loss of a very good man, we also celebrate his remarkable life and hope that it serves as an example to young people around the world to work hard to make their dreams come true, to be willing to explore and push the limits, and to selflessly serve a cause greater than themselves."