Chicken or Egg, October 4: The first vaccine, The Big Bang theory proposed, Pluto discovered, First Moon landing, First image of a black hole
Puzzle #4, Science & space, Sunday, October 4, 2026. Six things, one order. Here is the answer, earliest to latest.
Earliest
1
The first vaccine1796
Edward Jenner inoculated a boy with cowpox in 1796. The word vaccine comes from the Latin for cow.
2
The Big Bang theory proposed1927
Georges Lemaître, a Belgian priest, proposed an expanding universe in 1927, before Pluto was found.
3
Pluto discovered1930
Clyde Tombaugh found it in February 1930 by comparing photographic plates.
4
First Moon landing1969
Apollo 11, July 20, 1969.
5
First image of a black hole2019
The Event Horizon Telescope released it in April 2019.
Latest
The twistThe Big Bang theory proposed came first. The Big Bang theory proposed dates to 1927; Pluto discovered to 1930. Most people put them the other way round.