Question

There is no medium in space .So, how Astronauts communicate with the Earth? And how the Light and Heat travels through the Space by the Sun??

Answer 1

Answer:

How do astronauts communicate with each other? ... The astronauts have devices in their helmets which transfer the sound waves from their voices into radio waves and transmit it to the ground (or other astronauts in space). This is exactly the same as how your radio at home works

Heat travels through a vacuum by infrared radiation (light with a longer wavelength than the human eye can see). The Sun (and anything warm) is constantly emitting infrared, and the Earth absorbs it and turns the energy into atomic and molecular motion, or heat.

Answer 2

Answer:

astronauts communicate by radio waves

heat travel by radiation till they reach earth or any other planet

light is a beam of photons it doesn't require a medium to travel