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An event horizon refers to the point beyond which no light or energy signals can be detected once a star becomes a black hole—it is determined by the original starting mass of ... its life cycle. In other words, it is the point around a black hole beyond which no one can determine or witness any events since the mass of the black hole severely ...

There is potential energy and kinetic energy. Potential energy is associated with height and kinetic energy is associated with velocity. The other part of the calculation is range-to-touchdown. There is an equation that, when ...

An asteroid is an object, too small to be considered a planet that orbits the Sun. Most asteroids can ...

An important measure of rocket performance is specific impulse, (Isp). It is the number of seconds that a thrust of one kilogram of force can be maintained by one kilogram of propellant. It is ... that one pound of force can be maintained by one pound of propellant. So, Isp is independent of the system of units: metric or English. Isp can be calculated from the ... is about 300 seconds. For LOX/ hydrogen the Isp is about 460 seconds. Nuclear thermal rockets have an Isp of about 1,000 seconds and electric thrusters provide an Isp of 1,000 to 10 ...

... minimum velocity required to depart the gravitational field of an astronomical body. Imagine a rocket is launched straight up from Earth. As it goes up the booster eventually burns out and ... down. But the farther the rocket gets from Earth, the less gravity there is. Consequently, if the rocket is going at great enough velocity at burnout, it will keep slowing down but it will never actually stop and fall back to Earth. That velocity is escape velocity and for Earth it is about 25,000 miles per hour or about 36,000 feet per ...

An airlock is a device which allows movement from one kind of environment to another, while maintaining separation ...

... has four seasons, but each one lasts twice as long. Because the orbit of Mars is elliptical, the temperature can change greatly with the seasons. The surface temperature can rise to ... spring, this warm season may not be the best time to visit Mars because it is also the time when vast dust storms cover the Martian surface. ---- Answer provided by Laura ...

There is very little chance of getting lost in space. There are numerous satellites, telescopes, and other ...

Being in space means being with a very small group of people in a very small space station or ship—about the size of a two-bedroom home. Exploratory teams to the Moon and Mars will also be small at first. Seeing the same people everyday means that it will be easy to get tired of them and to want to see others. The teams will need to be very good at getting along with people in these ...

We cannot know what is inside a black hole because once an object goes beyond the event horizon of the black hole, we lose contact with it forever. The laws of physics do ... us to describe or even to completely understand the collapse of any mass beyond the event horizon. ---- Answer provided by Jim Zebrowski Image:K2S logosmall.jpg Question and Answer extracted from the ...

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