Soon they learn that the ship that helped them is owned by Ego (Kurt Russell), who claims to be Quill's father and invites Quill to visit his planet. Out of the blue, the Sovereign fleet is destroyed by a mysterious ship and the Guardians crash on a planet. However Rocket steals a couple of batteries and their spacecraft is attacked by the Ayesha and Sovereign. Peter Quill (Chris Pratt), Gamora (Zoe Saldana), Drax (Dave Bautista), Rocket and Baby Groot defeat the monster and receive the notorious Nebula (Karen Gillan), who is Gamora estranged sister, as previously agreed to receive the bounty offered for her. The Guardians of the Galaxy are hired by the leader of the well-planned Sovereign race Ayesha (Elizabeth Debicki) to destroy a monster to protect their valuable batteries. It won't be pleasant, but it won't be like the movies, either.' So, there's at least one data point about what it's like to be in a vacuum. He later said that his last conscious memory was of the water on his tongue beginning to boil.

Technicians began to repressurize the chamber within 15 seconds and he regained consciousness at around the equivalent of 15,000 feet of altitude.

He did not pass out for about 14 seconds, by which time unoxygenated blood had reached his brain. The pressure issue would also make it impossible to hold air in your lungs, so you would pass out within a minute, but likely much sooner: 'In 1965, while performing tests at the Johnson Space Center, a subject was accidentally exposed to a near vacuum (less than 1 psi) when his space suit leaked while in a vacuum chamber.

Your tongue would be susceptible as well. Correction: The pressure is important: Your eyes, if left open, would basically boil and surface freeze because of lack of pressure on the liquid. In fact, if you were to float in sunlight you'd sooner cook than freeze. This is what makes a vacuum a good insulator. In a vacuum the only way to lose (or gain) body heat is through thermal radiation. People exposed to the vacuum of space do not freeze in a matter of seconds/minutes.

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