In the interstellar movie, the communication with the world is done with rf. Is this possible?

The communication method shown in the movie "Interstellar" is more speculative compared to the existing technologies in the real world. The method of communication used in the film is a kind of space-time distortion used for communication between astronauts in space and Earth.

In the real world, radio frequency (RF) broadcasts are widely used in space research and communication systems. Communication with space explorations, space probes, and spacecraft missions in space is provided using RF signals. For example, RF signals can be sent from Earth to satellites and spacecraft in space, and communication can be established with them.

However, the method of communication shown in the film "Interstellar," namely space-time distortion, is speculative and is not yet possible in the real world. Space-time distortion is a complex physics concept related to the bending of space and time. This concept is based on Einstein's theory of general relativity and studies are ongoing in the field of theoretical physics.

Therefore, the method of communication with Earth via RF as shown in the movie "Interstellar" is not currently possible in the real world. However, as scientific research progresses and technology develops, more advanced methods of communication may be possible in the future.

How far is it possible to communicate with RF signals?

As for the maximum distance at which communication can be made with RF (Radio Frequency) signals, they are usually used for communication within the Earth's atmosphere and are generally adjusted according to distances on Earth. However, these signals are also used in space research and these signals can reach far beyond Earth.

For example, spacecraft such as Voyager 1 and Voyager 2 can still communicate with Earth using RF signals even though they are billions of kilometers away from Earth. Voyager 1, as of 2021, can still communicate with Earth even though it is approximately 22 billion kilometers away from Earth.

However, there are some difficulties in such communications. As RF signals spread in space, signal strength decreases. Therefore, a very strong transmitter and receiver are needed to communicate with a spacecraft at very far distances. In addition, these signals move at the speed of light, which can cause significant delays at distant distances. For example, it takes about 20 hours to send a signal from Voyager 1 to Earth.

Therefore, technically there is no upper limit for communication with RF signals, but in practice, these types of communications are usually limited to our solar system due to signal strength, delay time, and other technical difficulties.

So what techniques do we use when communicating with extraterrestrial devices?
When communicating with extraterrestrial devices, especially spacecraft and satellites, radio frequencies (RF) are usually used. In addition, several important techniques and protocols are also used.

Doppler Effect: The speed and direction of a spacecraft affect the frequency of the radio signal. This phenomenon is called the Doppler effect and helps control centers determine the speed and direction of the spacecraft.

Broadband Communication: Modern spacecraft usually use broadband communication, which allows more data transmission. This is very important for transmitting scientific data and other important information to Earth.

Error Correction Codes: Radio signals in space are usually sensitive to errors. Therefore, error correction codes are often used to increase the reliability of these signals.

Satellite Antenna Networks: Satellite antenna networks, like NASA's Deep Space Network, provide continuous communication from Earth to spacecraft in space. These networks are usually distributed in different regions of the world, thereby minimizing communication interruptions due to Earth's rotation.

Communication Protocols: Communication between spacecraft and control centers is provided using various communication protocols. These protocols ensure that data transmission is carried out correctly and efficiently.

Laser Communication: In addition to RF radio waves, laser-based communication technologies are also being developed. Laser communication can provide much higher data transmission speeds, but the technology is still in the development stage and it may take time for it to become widely available.

Each of these techniques makes it possible to communicate reliably and effectively with extraterrestrial devices.