The writer mention two function of life in space their differ from life in earth? what are they..
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As the 20th century began, interest in the potential of life on Mars and the possible civilizations there lead to a search for signals. Could we communicate with another planet? How might we look for signals and messages from other worlds?
An 1896 newspaper article titled "A Signal from Mars" offered one example of how we might receive communications from the planet. In noting "a luminous projection on the southern edge of the planet", the article suggests that this might be because "the inhabitants of Mars were flashing messages" to Earth. We can find this same idea in a piece of music. The 1901 piece, "A Signal From Mars, March and Two Step" offers music that Martians might be playing for us. From the cover illustration, it would appear that one rather civilized Martian is using a spotlight to communicate the tune while the other watches Earth with a telescope, likely waiting to see if we have the same taste in marches and two steps. Soon, the development of radio technology would provide a much more powerful way to listen for and send messages to other worlds.
Tesla Promises Radio Communication with Mars
In the late 19th and early 20th centuries the idea and development of wireless telegraphy, sending and receiving electromagnetic waves through the air, offered new method of searching for communications from space. In 1901, engineer Nicola Tesla made the astonishing claim that he was receiving radio communications from Mars. His story was picked up and reported on broadly in the press.
An article from the Richmond Times offered an extensive description and commentary on his alleged discovery. "As he sat beside his instrument on the hillside in Colorado, in the deep silence of that austere, inspiring region, where you plant your feet in gold and your head brushes the constellations — as he sat there one evening, alone, his attention, exquisitely alive at that juncture, was arrested by a faint sound from the receiver — three fairy taps, one after the other, at a fixed interval. What man who has ever lived on this earth would not envy Tesla that moment!" While Tesla's alleged communications with Mars captured media attention, it did not capture much serious interest from scientists.
Hello Earth!
As radio took off, so did stories of communicating with Mars. One such article from 1920, Hello, Earth! Hello! Marconi believes he is receiving signals from the planets provides extensive commentary on similar signals observed by the Italian engineer Guglielmo Marconi. Aside from describing this discovery, the article quotes Thomas Edison as saying Marconi's work offers "good grounds for the theory that inhabitants of other planets are trying to signal to us." As radio developed as a medium for communications in the early 20th century it was also positioned for listening for contact from other worlds. While it would quickly become clear that there weren't signals from Mars, radio would play a critical role in the search for life on worlds outside our solar system.
In the 1930s and 40s radio became an invaluable instrument for observing the heavens. As astronomers began developing radio telescopes they made discoveries of various sources of electromagnetic waves in the heavens and these became useful sources of observational data about the space.