Space Science and Astronomy thread



OSIRIS-REx returned home samples successfully.

It is amazing when you think about it. Probe launched on rocket, undocked once out the atmosphere and a blast of thrusters set it off on it's way to perfectly arrive at a moving target, and asteroid. Scoop samples off the surface of the asteroid, automatically seal them in containers before heading back to earth. Once near our atmosphere, a sturdy sample return container is fired into the atmosphere and it slows down with a heat shield and parachutes to land exactly where it was supposed to.

These things are not like driving a car or a plane. You have limited propellant for manoeuvres so you can't just drive it back directly, Star Trek style. The trajectory had to be calculated before launch with only a limited amount of slight changes needed. Gravity and orbital mechanics did the main bit. The animation here is great.
Kick the probe into an orbit slightly different to Bennu, knowing that after a couple of years the two would be in sync, then kick it off again knowing after a few more years it's orbit would cross the path of earth, the two would meet and be captured in earth's gravity.
 
Anyone recommend an inexpensive telescope for an enthusiastic amateur to do some star/planet/moon-gazing?
I think their budget is around £100+
 
Anyone recommend an inexpensive telescope for an enthusiastic amateur to do some star/planet/moon-gazing?
I think their budget is around £100+
You might want to try Rother Valley Optics mate. You can drop them an email direct from their website, tell them what you're after, and they'll advise you. I use these and they're great to deal with. They actually have quite a few telescopes on their website that are within your budget.
www.rothervalleyoptics.co.uk
 

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