Why do they have a Snellen eye chart on the ISS?

8yr ⋅

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Can I borrow a lunar rover?

11yr ⋅

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Why did Voyager 2 receive a gravitational slowdown (as opposed to a slingshot) at Neptune?

9yr ⋅

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Why is it hard to take a high quality image of far away objects (like Pluto) using a high-tech space telescope?

9yr ⋅

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Why is there a hole in solid rocket engines?

9yr ⋅

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Why are there so few lunar rovers?

9yr ⋅

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Could liquid airlocks work?

9yr ⋅

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Was the NOAA-N Prime satellite really dropped on the floor?

11yr ⋅

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What are the unpleasant effects of having a cold in microgravity?

9yr ⋅

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Why are the GPS constellation satellites in such a high orbit?

9yr ⋅

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When/where did the cosmonauts fight wolves?

9yr ⋅

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Why does the ascent stage of Apollo 11's lunar module look like it's made of paper?

10yr ⋅

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What did the sky actually look like from the Moon?

9yr ⋅

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Why is gold used in space technology to protection from heat radiation?

10yr ⋅

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Is this really Rosetta's orbit around 67P?

10yr ⋅

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Why does the CRS-8 Falcon 9 rocket appear to be swaying before launch?

7yr ⋅

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What are the towers around the SpaceX launch pad used for?

11yr ⋅

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How is JunoCam different from a normal CCD camera?

8yr ⋅

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Any imagery from Shuttle Columbia's SILTS pod on the internet?

8yr ⋅

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How possible are 'space jumps'?

11yr ⋅

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Why is the SABRE engine curved?

9yr ⋅

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What (actually) makes Iridium the world's only truly global mobile satellite communications company?

8yr ⋅

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Can you take a bath on Mars?

8yr ⋅

⋅

What constellation is on the NASA logo?

10yr ⋅

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What is this instrument on the ISS?

7yr ⋅

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What is this on the craft from the Apollo 17 mission?

8yr ⋅

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Would my weight be constant on Pluto?

9yr ⋅

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Why isn’t the “JRTI” barge larger?

9yr ⋅

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How did the Falcon 9's 1st stage return back to Cape Canaveral?

9yr ⋅

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How is the Hubble main mirror protected from debris?

9yr ⋅

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Has DSS-43 ever been used in high power mode (>>20 kW) for an emergency situation?

8yr ⋅

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Why are spaceship capsules frustum shaped?

10yr ⋅

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Spatial screwdriver

7yr ⋅

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Why didn't Pioneer 11 visit Uranus/Neptune, and why didn't Voyager 1 visit Pluto?

9yr ⋅

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SpaceX's ITS - why gimbal only the inner cluster?

8yr ⋅

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Saturn V Exhaust Plume

10yr ⋅

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Could a helicopter fly on Mars?

8yr ⋅

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How did astronauts navigate the Lunar Roving Vehicle (LRV) over the surface of the Moon?

9yr ⋅

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How does a single SRB control attitude?

7yr ⋅

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How can just making the ground broadcast stronger neutralize a zombie(sat)?

8yr ⋅

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Why is the Shuttle Landing Facility runway surrounded by water?

11yr ⋅

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Why do the LRO's orbital elements appear to constantly oscillate - except recently?

7yr ⋅

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What is the feasibility of launching a probe to Sedna?

11yr ⋅

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If we could send an orbiter to the Pluto-Charon system, could we put it in a stable orbit?

8yr ⋅

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What are these enclosed regions on the Mission Control Center map?

9yr ⋅

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What ever happened to SHERPA?

7yr ⋅

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How is 80 to 150 days to Mars possible at 6 km/s TMI Delta V?

8yr ⋅

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Why is there a coasting phase in some space launches?

10yr ⋅

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What are the rectangular wires around Atlas V launch site?

8yr ⋅

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PUZZLER: Around how many solar system bodies are there Legos in orbit?

7yr ⋅

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How does the landing accuracy of Dragon (under parachutes) compare to Soyuz?

8yr ⋅

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Why did the Venera missions land so close together?

9yr ⋅

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Does NASA use Newtonian model of gravity for plotting the course of Juno or general relativity?

8yr ⋅

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How can delta-v and aerobraking as shown in this chart be explained?

8yr ⋅

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final conclusion/description of the cause of the SpaceX Sept. 1, 2016 anomaly,

7yr ⋅

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Why explore Ceres?

9yr ⋅

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How do we define geographical coordinates on non-spheroid celestial bodies?

7yr ⋅

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How fast could a person run on the Moon?

10yr ⋅

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How much does it cost to fill an ion thuster with Xenon for a spacecraft propulsion system?

9yr ⋅

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Why multiple lightning towers at launch sites?

10yr ⋅

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Why did Voyager 2's velocity drop far below escape velocity before the first gravity assist?

9yr ⋅

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How do single engine rockets control roll?

10yr ⋅

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Why does NASA's Juno spacecraft only have a one year primary mission?

9yr ⋅

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What pushes a spacecraft during a flyby?

9yr ⋅

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Why do geosynchronous satellites appear to oscillate in North-Southward direction? How to I trace out their path on the surface of the earth?

8yr ⋅

⋅

Making propellants on Mars: Why not just LH2/LOX instead of methane?

8yr ⋅

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What uses would the Aldrin-Cycler have?

11yr ⋅

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How do astronauts take pictures from outside the ISS?

9yr ⋅

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TR-106 under-expansion in sea-level test?

7yr ⋅

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Transfer between elliptical orbits

9yr ⋅

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Is this really the logo of the North Korean space program?

8yr ⋅

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What are the crossing beams of light in the Cassini images taken during Enceladus plume flyby?

9yr ⋅

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Why don't we take the shortest route to Mars?

9yr ⋅

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Why did a flight controller say Avionics power nominal as Antares exploded?

10yr ⋅

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How do spacecraft measure their own charge?

7yr ⋅

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What is/will be the function of the United States National Space Council?

7yr ⋅

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Could you fly on the Moon, in Earth's atmospheric pressure, by flapping wearable wings?

10yr ⋅

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When will we have the technology to directly observe an exoplanet with significant clarity?

11yr ⋅

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Are the ISS US Segment solar arrays double-sided?

7yr ⋅

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How do the Soyuz flight control sticks operate?

9yr ⋅

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Is there any way to find and track Pioneer 10, 11, and Voyager 1, 2?

11yr ⋅

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How do iPads on the ISS know which way is up for their users?

7yr ⋅

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Stand clear sign on Soyuz capsule underside

9yr ⋅

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How do items from the Russian and Soviet space programs end up in private collections?

7yr ⋅

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What's the coin on the Curiosity rover?

11yr ⋅

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What is the reason for the Ariane 5 launcher with Intelsat 29e losing altitude?

8yr ⋅

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Why are rocket mass on the launch pad and payload mass to LEO not strongly correlated?

9yr ⋅

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Many moons in same orbit

9yr ⋅

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Why does the Soyuz cover its main engine?

10yr ⋅

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Why didn't the Apollo 11 lander blow the dust away? (or why does it look like it didn't)

11yr ⋅

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Could permanent self-sustaining biodomes be built on Mars?

9yr ⋅

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Who took the Curiosity rover's self-portrait photo from the surface of Mars?

11yr ⋅

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Do Mariner 4 hand rendered images still exist?

9yr ⋅

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Why is the center engine in the Falcon 9 (and Falcon Heavy) Octaweb layout at a different elevation with respect to the outer engines?

9yr ⋅

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How did scientists put forth or create the images of milky way galaxy

7yr ⋅

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What is the ring at the bottom of the Merlin vacuum engine?

7yr ⋅

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Will suits worn on Mars lose kilograms of expendable water each time they are used?

8yr ⋅

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Is NASA doing research on mini-magnetospheres to protect crew from radiation in space?

7yr ⋅

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What could the X-37 be useful for?

10yr ⋅

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Why has the Earth's motion carried it out of view of Pioneer 11's antenna?

8yr ⋅

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Reason for space debris clustering in LEO

11yr ⋅

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What is the mysterious Ball of Mars?

10yr ⋅

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What caused the ISS's sudden loss of altitude in January 2015?

9yr ⋅

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Negative photon pressure? What is the physics behind this expression?

7yr ⋅

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Why is there supposed be a current passing through the grids in an Ion Thruster?

7yr ⋅

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How will the ExoMARS Rover keep it's solar panels dust-free and collecting maximum power?

8yr ⋅

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What savings allowed James Webb telescope to be lighter than Hubble?

8yr ⋅

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Does the space shuttle fly straight up when leaving Earth?

10yr ⋅

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What is the correct thrust curve for a solid rocket with a simple circular hole, and why?

8yr ⋅

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Did New Horizons also demonstrate the Pioneer Anomaly?

8yr ⋅

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Who is the space artist?

8yr ⋅

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Approximate sizes and relative positions of the ISS' cupola windows?

7yr ⋅

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Simulate celestial body motion on hyperbolic trajectory (2D)

7yr ⋅

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Why does the video feed always fail during Falcon 9 landings?

8yr ⋅

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Does the proximity of engines in engine clusters cause interference?

11yr ⋅

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What happens to defunct lunar and Mars rovers? What technological barriers prevent humanity from creating a perpetual rover?

11yr ⋅

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Why is the Russian approach to the aerodynamics of their rockets different?

10yr ⋅

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Timing shadows from the Kuiper belt! Any news? Did it work?

7yr ⋅

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What went wrong with the CRS-7 launch?

9yr ⋅

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