In the English system, three of the 7 days of the week are obviously named after astronomical bodies - Sunday=Sun, Monday = Moon, Saturday = Saturn. The other five are named after Norse mythological beings:
Tuesday - Tiw (or Tiu), the Old English form of the sky and war god Týr.
Wednesday - Woden(or Odin), the chief deity in Norse mythology.
Thursday - named after Thor, the Norse god of thunder.
Friday - Frigg (or Frigga). Is the Norse goddess of love, marriage, and wisdom.
If you look at the French words for these days, their planetary origins are more apparent:
Tuesday is Mardi, or Mars Day.
Wednesday is Mercredi, or Mercury's day.
Thursday is Jeudi, or Jupiter's day.
Friday is Vendredi, or Venus' day.
You lost me after "noun."How Radio Waves Were Discovered
radio /rā′dē-ō/
noun
- Electromagnetic radiation with lower frequencies and longer wavelengths than those of microwaves, having frequencies lower than 300 megahertz and wavelengths longer than 1 meter.
- The transmission and reception of electromagnetic waves within this range, especially when convertible to audible sounds.
"the use of radio in warfare."- A device, such as a walkie-talkie, that transmits or receives such signals.
- The system or industry that broadcasts programs of audio content to the public or subscribers by means of radio waves.
"She was famous during the early days of radio."- Audio content, especially short programs or sets of songs, created for or distributed through such a system.
"listening to radio."- An electronic device for listening to radio programming, consisting of a tuner and speakers.