Which statement must be true in order for a rocket to travel from Earth to another planet?
Which statement must be true in order for a rocket to travel from Earth to another planet? Your Answer: It must attain escape velocity from Earth.
Do astronauts age slower?
And for astronauts on the International Space Station, that means they get to age just a tiny bit slower than people on Earth. That’s because of time-dilation effects. First, time appears to move slower near massive objects because the object’s gravitational force bends space-time.
Is there gravity in space?
Some people think that there is no gravity in space. In fact, a small amount of gravity can be found everywhere in space. Gravity is what holds the moon in orbit around Earth. It is possible for a spacecraft to go far enough from Earth that a person inside would feel very little gravity.
Can you start a fire in space?
Fires can’t start in space itself because there is no oxygen – or indeed anything else – in a vacuum. Yet inside the confines of spacecraft, and freed from gravity, flames behave in strange and beautiful ways. They burn at cooler temperatures, in unfamiliar shapes and are powered by unusual chemistry.
What happens if you light fire in space?
Fire is a different beast in space than it is on the ground. When flames burn on Earth, heated gases rise from the fire, drawing oxygen in and pushing combustion products out. In microgravity, hot gases don’t rise. Space flames can also burn at a lower temperature and with less oxygen than fires on Earth.
What if you fired a gun in space?
Fires can’t burn in the oxygen-free vacuum of space, but guns can shoot. In space, “it would be an expanding sphere of smoke from the tip of the barrel,” said Peter Schultz an astronomer at Brown University who researches impact craters.
Can a gun be fired underwater?
No, you should never fire a gun underwater. Depending on the type of gun, it is possible to fire underwater. Water is obviously more dense than air, when you try to fire bullets underwater, the weight of the water slows down the bullet making it lethal in just a few steps away unlike when you fire it above the surface.
Can a body decompose in space?
If you do die in space, your body will not decompose in the normal way, since there is no oxygen. If you were near a source of heat, your body would mummify; if you were not, it would freeze. If your body was sealed in a space suit, it would decompose, but only for as long as the oxygen lasted.
How long can you survive in space without a suit?
At most, an astronaut without a suit would last about 15 seconds before losing conciousness from lack of oxygen. (That’s how long it would take the body to use up the oxygen left in the blood.) Of course, on Earth, you could hold your breath for several minutes without passing out.
Why can we breathe on Earth but not in space?
We’re able to breathe on earth because the atmosphere is a mixture of gases, with the thickest gases nearest the earth’s surface, giving us the oxygen we need to breathe. In space, there is very little breathable oxygen. This prevents the oxygen atoms from joining together to form oxygen molecules.
What happens if you get sick in space?
Most obviously, the physically extreme act of launching off-Earth in a rocket can cause motion sickness and can affect spatial orientation and coordination. Once in space, changes in stress hormone levels and other physical repercussions of spaceflight cause your immune system to change.
What happens if you sneeze in space?
A cough or sneeze on Earth blasts infectious particles from 3 to 6 ft. (1 to 2 m) away before gravity takes over and they fall out of the air. In space, they float everywhere. When they do land, they don’t settle in some safe, out of the way place, because in a spacecraft there is no out of the way.
Do you poop when you are in a coma?
Yes, coma patients have bowel movements. Because people in a coma can’t express themselves, doctors must rely on physical clues and information provided by families and friends. First, doctors ensure that the patient isn’t in immediate danger of dying.