We could send aliens information that is good about us not the bad things. Don't share weaknesses, because that could probably lead to some bad things. We should share valuable info with the aliens.
If alien life ever gets a chance to communicate with us and we have a chance to communicate with them then we must show them how much knowledge we hold so they can better understand our customs and what to show us. We will probably show them the key sciences such as Math, Science, Biology, Phycology, Astrology, Astronomy, and our knowledge of technology. We will first show them simple problems we know like 2+4 and 1+1. After we will show them huge amounts of our psychological capabilities like our vast arrays of calculations and formulas. This is just a small fraction of our knowledge we will show them.
Radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium which therefore means that radiation doesn't require particles or matter.
