How do astronauts communicate with Earth during space missions?

In summary, communication from outer space, such as the moon, Mars, and Pluto, can be achieved through radio signals or laser technology. However, due to the vast distances, there will always be a delay in communication equivalent to the speed of light. Even a phone conversation through a satellite suffers a noticeable lag. This is because radio signals and light are both forms of electromagnetic radiation.
  • #1
yalgaar
15
0
I have always wondered about this. When we went to the moon how did we communicate back to earth?

On the same note, what are the ways to communicate from the outer space? i.e from moon, mars, pluto?

If we managed to visit a place 20 light years away, how could we communicate back to Earth based on current technologies we have?
 
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  • #2
Radio
Radio
Radio - but it would take awhile for the signal to get back.

For line of sight communications you could also use lasers but except possibly for some
military kit I don't think anything does
 
  • #3
mgb_phys said:
Radio
Radio
Radio - but it would take awhile for the signal to get back.

For line of sight communications you could also use lasers but except possibly for some
military kit I don't think anything does

To my understanding Radio signals use light. So would it be right to say that the maximum speed at what we can communicate with anything in space is at speed of light?

Would it be right to say that if we somehow managed to send a spaceship to a planet that is 10 lights years away, every communication that will take place will have a delay of at least 10 years?
 
  • #4
Yep, on every count.

Even a phone conversation which goes through a comsat suffers a noticeable lag, about .5s. This is a reason that a ISP using a satellite dish in not good for online gaming.
 
  • #5
yalgaar said:
To my understanding Radio signals use light.
Just to clarify, radio signals and light are just two different forms (frequencies) of the same thing: electromagnetic radiation.
 

1. What is the purpose of communications from space?

Communications from space allow for the transmission of information and data between objects in space and Earth, such as satellites, spacecraft, and rovers. This enables us to gather and share important information about our universe, including weather patterns, natural disasters, and other scientific data.

2. How do we receive communications from space?

To receive communications from space, we use a variety of technologies, including antennas, receivers, and transmitters. These devices work together to capture and interpret signals sent from space and transmit them to ground stations on Earth.

3. What types of information can be communicated from space?

A wide range of information can be communicated from space, including images, videos, audio transmissions, scientific data, and more. This information is transmitted using different communication methods, such as radio waves, microwaves, and lasers.

4. What challenges are involved in communicating from space?

One major challenge in communicating from space is the vast distance between objects in space and Earth. This requires powerful and precise communication technologies to ensure that signals are transmitted and received accurately. Additionally, factors such as solar flares, space debris, and atmospheric interference can also affect communications.

5. How does communication from space impact our daily lives?

Communication from space plays a significant role in our daily lives, from providing accurate weather forecasts to enabling GPS navigation and facilitating global communication and internet connectivity. It also allows for scientific advancements and research in areas such as astronomy, environmental monitoring, and space exploration.

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