There are two primary things affecting a rocket’s journey to outer space: To reach outer space, rockets need to spend energy against Earth’s (or another object’s) gravity. Read the sidebar BEFORE posting.Press J to jump to the feed.

The obvious uses are interplanetary travel, circularizing a parabolic orbit, refueling existing satellites.Or at least using the propellants from shallower gravity wells.Gotta start asteroid mining to make that viable. Yes, an hypersonic engine makes for a larger stage, and an dual one that can operate with and without air makes for an even larger stage, but they are of the same broad category.We 'just' need a way of making fuel from asteroids or on the moon.I dont recall the exact number, but I think that altitude is 50% of the energy, the other 50% is horizontal velocity. Launching directly from the surface of the Earth to Mars or the Moon is cheaper (energetically) than first trying to get into Earth orbit. Especially since the change in trajectory required results in much higher drag losses, and more worse thermal performance (rocket gets hotter)With the notable exception of anti satellite weapons which have often been fired from military aircraft. And in some ways, rockets are simpler structurally as their typical load case is pressurization and axial loading (which is often in the same direction). Putting stuff in orbit is more expensive than just sending straight to their destinations.
To accurately calculate his position in space, safely align his warp drive, and return to Earth in time to save Christmas, he needs you to bring him measurements from fifty stars. This saves the weight of the oxidizer.Air breathing saves wet-mass, but increases dry mass.

Credit: NASANASA astronaut Don Pettit works with two still cameras mounted together in the Destiny laboratory. Because the Earth’s gravitational pull is still large enough that our chemical propellant rockets can never be a lot more efficient, the Moon becomes an interesting place.Being able to extract raw materials of the Moon and harness them would free us from the need to drag everything to space from Earth’s large gravitational pull. Given any two of these, the third becomes cast in stone. There have been some experiments in this direction, notably Richard Branson's.No?

If we include the extra 1.5km/s of delta-v that we loose to drag it becomes 28% to 72%.At the typical parameters of stage separation from the first stage the split is 3% to 97%. The Moon has a much lower 3. at the edge of the capability of modern aircraft), the fuel:payload ratio for ITS (Starship) or an airliner would be about the same, might be even better for Starship/ITS.

"Indeed, asteroids are the best places.

Using an airplane as a first stage of a rocket gives the exact same air-breathing advantages as using a rocket (or better, because the planes uses air as reaction mass too). Being high isn't enough.Currently all the stuff we want to launch is on the ground, though. Not an issue for flybys, but an issue if you want to get into an orbit.

And you'd have to pay that 94% pretty quickly to not fall down.You would fall back down to earth. The rocket equation captures the essentials of rocket flight physics in a single short equation. Collect stars by solving puzzles. Although a momentum balance, these variables can be cast as energies. Near the edge of their range, cargo airliners have about 2-4:1 fuel to payload capability. Using static electricity to spin water droplets around a knitting needle. The mass ratio directly depends on the Around this area, we end up with rockets having more than 80–90% as just the propellant. Credit: NASAA zucchini plant grows inside the International Space Station.


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