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... 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 also the number ... 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 specific energy or from the exhaust ... Isp 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 10,000 ...

... 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 ...

... or energy signals can be detected once a star becomes a black hole—it is determined by the original starting mass of the star before it started collapsing at the end of its life cycle. In other words, it is the point around a black hole beyond which no one can determine or witness any ...

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 ...

... arm out and wave it around, you are feeling the atmosphere. The Earth's atmosphere is composed mostly of nitrogen and oxygen molecules with other minor gases. We breathe the oxygen ... upward we travel from the surface. Ten miles up the pressure is one-ninth of the surface; 15 miles up it is one-twenty-seventh of the surface. Commercial jets fly about five miles up and the air is very thin. The edge of space is roughly 60 miles up and the air is so thin that commercial planes cannot fly and ...

... of the ISS. Each laboratory differs in size. The US laboratory (named Destiny), for example, is 28 feet long and 14 feet in diameter and the Japanese laboratory (named Kibo, which ... at space or the Earth. There are places to store food and water, and there is an airlock that the astronauts use when they go on a spacewalk. The astronauts also ... tools on board so they can work on things. A large portion of the ISS is made up of large solar arrays that generate electricity from the Sun's energy. These ...

... be symmetrical. If you describe black holes as a gravitational well in space where matter is continuously falling in, the opposite solution in time would be an area of space where ... actually allow matter to escape into space. This is a white hole. Now, if there is a rotating black hole in space, there is a chance for an object to fall into a ... within our Universe or perhaps be connected to different universes. Now that I have described what it is, I must emphasize that scientists currently do not believe white holes or worms holes ...

... —28 years ago. Voyager 1 has now traveled over 8.6 billion miles and is the furthest man-made object from Earth. The longest manned space journey was carried out ... they have spent off the Earth on all their flights, Russian cosmonaut Commander Sergei Krikalev is the winner, with 803 days total so far ---- Answer provided by Hazel McAndrews Image:K2S ...

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