Linked Questions

16 votes
4 answers
10k views

Current situation with CoCom regulations and GPS receivers for balloons and cubesats

I wanted to ask this at aviation SE because they are quite rules-and-regulations oriented there, but this question is not (really) about aviation. I'm trying to understand the current situation for ...
uhoh's user avatar
  • 149k
9 votes
4 answers
1k views

Recent Falcon 9 flights - 'topped off' with propellants, or just a margin over what's needed to land?

A simplified version of the landing choices might be - if there's going to be sufficient propellant, the plan is for the F9 first stage to u-turn and go all the way back to the launch area to land. ...
uhoh's user avatar
  • 149k
11 votes
3 answers
3k views

Are pictures taken from ISS geolocalized?

I guess my question is "naive". I get from https://images-api.nasa.gov some pictures of Earth from ISS without any description (just the mission number) or pictures of crewmembers. Taken ...
david's user avatar
  • 253
7 votes
3 answers
3k views

How do other satellite and ICBM clocks interact with GPS satellite clocks

I've read this answer about satellites synchronizing their clocks with the Earth frame with adjustments for special and general relativity for speed and gravity. There are some satellites and ICBMs ...
foolishmuse's user avatar
2 votes
3 answers
15k views

Can a smart phone function in space?

I recenty came a across a doubt... Can a smart phone be used in space? Obviously you aren't going to get any data signal, but will the functions like touch screen, GPS, accelerometer, vibrator, etc, ...
SidS's user avatar
  • 129
22 votes
2 answers
5k views

How did NASA Conclude that the General Theory of Relativity was not Needed for Earth-Moon Flight Path Computation?

This question is wholly seeking historical evidence and not about physics. It is a follow on from the Physics Stack Exchange question: Could we send a rocket to the Moon without knowledge of general ...
Selene Routley's user avatar
6 votes
2 answers
2k views

CubeSat Orbit Determination

I'm thinking about the feasibility of making a CubeSat to test the EM drive thruster. Assuming the microwave electronics and resonant cavity could be scaled down to CubeSat size (5 watts, let's say), ...
zplizzi's user avatar
  • 163
4 votes
2 answers
373 views

What's this dark, ceiling-mounted hemisphere in Tianhe module of Tiangong space station? Any counterpart on the ISS and if so what does it look like?

The first crew of the Tianhe core module of the Tiangong space station has been hard at work and already complete their first space walk. In this official photo there is a dark hemispherical structure,...
uhoh's user avatar
  • 149k
2 votes
2 answers
4k views

How to get velocity vector from GPS NMEA data?

I am writing a program to receive and interpret NMEA data from a GPS receiver. I am working with an Adafruit Ultimate GPS Receiver integrated with an Arduino. The $GPRMC NMEA Sentence contains the ...
AneeshCRao's user avatar
24 votes
1 answer
3k views

Where is the TEA-TEB stored for the Merlin engines onboard Falcon 9?

The Merlin 1D engines can restart up to four times, they use the pyrophoric mixture of TEA-TEB (Triethylaluminum-Triethylborane) to ignite the engines. My question is where is this stored in the ...
Jake Blocker's user avatar
  • 4,285
3 votes
1 answer
297 views

How many spacecraft deployed from the ISS have escaped Earth orbit? Are there plans for any in the near future?

After reading Why did the Ulysses probe reach Jupiter much faster than Galileo? and answers to How many Space Shuttle payloads ended up beyond Earth orbit? and also What's the largest rocket that was ...
uhoh's user avatar
  • 149k
2 votes
1 answer
1k views

Do Phonesats and GoPros work with their internal batteries in space vacuum?

After reading the question OTS rechargeable battery for a lunar rover I wondered about examples of OTS (off-the-shelf) batteries in space. There has been at least one cellphone-based satellite, and ...
uhoh's user avatar
  • 149k
1 vote
1 answer
163 views

What are some objective that CubeSat's can complete/have completed?

I've been seriously considering looking into launching a CubeSat and it seems that the least of my worries would be design constraints. The money is less of an issue than the "why". There's plenty of ...
Magic Octopus Urn's user avatar
7 votes
0 answers
780 views

Are software defined GNSS (GPS) receivers legal under ITAR and other export regulations?

With the latest update to ITAR rules, it looks like covered GNSS receivers are defined as follows: (2) Global Navigation Satellite System (GNSS) receiving equipment, as follows: (i) GNSS receiving ...
Manuel Menzella's user avatar
2 votes
0 answers
131 views

How to determine altitude when altimeters fail?

Specifically for high altitude amateur rocketry, how is altitude determined when you get too high(too low pressure) for barometric altimeters to work? I heard about GPS, however, COCOM limitations ...
Lucas Thelen's user avatar

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