Hacker Newsnew | past | comments | ask | show | jobs | submitlogin

Sub-orbital. Think getting the craft up to altitude of 100+ km, hang out for a few minutes, and descend back to Earth. SpaceShip One, the prototype inspiring the Virgin Galactic fleet, was capable of reaching speeds of 0.9 km/s. [1] Escape velocity to get into orbit from Earth's surface is 11.2 km/s. [2]

[1] https://en.wikipedia.org/wiki/SpaceShipOne

[2] https://en.wikipedia.org/wiki/Escape_velocity



Escape velocity is a velocity to escape gravitational field. Orbit velocity is a velocity to orbit a thing inside its gravitational field.

For example, ISS has orbit speed of about 7.7 km/s at 350 km above the ground. Orbit speed "at the surface" of Earth is about 8km/s, I believe.


Thanks for the clarification.


My point, not to be overly disrespectful, is that suborbital flights are so different from what SpaceX has done that they seem like party tricks, not stepping stones.

In the big picture, it's not a huge amount wasted, I was just remarking on it being less significant in retrospect than one might have hoped.




Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact

Search: