Linked Questions

19 votes
3 answers
23k views

Apollo communication between the Earth and Moon

How was it possible for astronauts to send back tv/radio signals to earth from the moon? I have just been teaching my son about waves behavior and understand that radio waves are reflected back to ...
slick's user avatar
  • 199
22 votes
1 answer
3k views

How hard is it to receive direct signals from vehicles on the surface of Mars, and has anyone other than the DSN done so?

Almost all communication from vehicles on the surface of Mars is relayed by spacecraft in orbit around Mars. However vehicles on the surface do communicate directly with Earth. This communication, ...
user avatar
7 votes
2 answers
1k views

Encryption in radio system

We know that radio waves are used in communication with rockets, space crafts and satellites. Now, radio system basically consists of transmitter and receiver. If there is frequency match between ...
peaceHoper's user avatar
10 votes
2 answers
2k views

Have there ever been any Satellites that were hacked, is that a possibility?

Have there ever been any Satellites that were hacked by a rogue nation or hacker groups, if not is it possible to accomplish such a task? Hack a satellite and take control of it.
Ashwin's user avatar
  • 111
12 votes
1 answer
2k views

Is NASA's Deep Space Network possibly a backup link for China's Zhurong rover?

While the Tianwen-1 orbiter will dispense commands to the Zhurong rover, the Mars Express orbiter of the European Space Agency will serve as a backup. Wikipedia Since Mars Express normally ...
DrSheldon's user avatar
  • 47.9k
4 votes
1 answer
3k views

What was the transmitting power of the Apollo astronauts' PLSS VHF radio transmitters?

I'm assuming many of you are familiar with Larry Baysinger. A radio amateur who independently detected and recorded the transmissions from the Apollo 11 EVA using a homemade antenna. Larry Baysinger ...
Star Man's user avatar
  • 5,918
6 votes
3 answers
450 views

How far away can spacecraft be seen with an optical telescope?

In the question At what time in the Apollo 14 mission did the maneuver shown in this image happen, and what exactly was happening? I've included the image and information below. The caption says that ...
uhoh's user avatar
  • 149k
6 votes
1 answer
1k views

Why such a large observed doppler shift from Apollo 17 orbiting the moon?

Following the links in this comment by @Uwe I've found some interesting sources of information on Ham (amateur) radio operators trying to listen in on Apollo transmissions. One of them is Sven Grahn's ...
uhoh's user avatar
  • 149k
15 votes
1 answer
987 views

Would it be possible to receive the transmissions from JWST as an amateur?

Would it be possible to receive the transmissions from JWST (James Webb Space Telescope) as an amateur, building your own antenna? Would the transmissions be encrypted? One source cites it using: S-...
Jonathan DS's user avatar
-1 votes
2 answers
429 views

Has anybody ever picked up the signal transmitted by a successful Mars lander or rover sent by the United States? [closed]

It is known that on February 4, 1966, the picture transmitted from the Moon by Luna 9 was intercepted by UK. The question is, has anybody ever picked up a signal transmitted by a successful Mars ...
azot's user avatar
  • 981
3 votes
1 answer
396 views

Does the Juno spacecraft have an "open signal, by design"?

The click-bate title'd Space News article China quietly used NASA’s Jupiter probe to test its deep space network contains the quoted material below. Everybody listens to everybody else's spacecraft's ...
uhoh's user avatar
  • 149k
5 votes
1 answer
301 views

space piracy, has it ever happened?

Recently i was watching the movie "The martian" where and that got me wondering, has something like that ever happened in real life, where someone (a person or organization) has became a ...
Topcode's user avatar
  • 893
3 votes
2 answers
225 views

Is it allowed to interact with research satelites / rovers using the radio?

Let's say I have a SDR (software defined radio) like the HackRF One at home, access to a huge amplifier circuit and a giant antenna (at my university). Is there a law that prohibits receiving / ...
publicdomain's user avatar
  • 1,222
6 votes
1 answer
282 views

How does NASA ensure nobody else communicates with probes? [duplicate]

We often hear about how various parts of Voyager have been turned off or on, or how course corrections have been made. How does NASA know that nobody else on Earth can send instructions to a probe? It ...
Marnanel Thurman's user avatar
0 votes
1 answer
210 views

What spacecraft components are in the foreground of this image of the Earth and Moon? What is the camera inside of?

This tweet shows the image below, and says: Finally, some images from Queqiao, the relay satellite for the Chang'e-4 far side mission, showing the Earth and Moon! Queqiao is in a halo orbit at a ...
uhoh's user avatar
  • 149k

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