IOAA 2019, Теория — Задача 1. Famous astronomical events

Correct solution: (10 p)

1. 1764: Discovery of the first planetary nebula
2. 1781: Discovery of Uranus
3. 1801: Discovery of Ceres
4. 1838: First successful measurement of a stellar parallax
5. 1877: Discovery of Phobos and Deimos
6. 1929: Discovery of the expansion of the Universe
7. 1943: Discovery of stellar populations
8. 1963: First identification of a quasar with an optical source
9. 1976: Viking probes arrived at planet Mars
10. 1986: Latest perihelion of comet 1/P Halley
11. 1990: Launch of the Hubble Space Telescope

• 1990: Launch of the Hubble Space Telescope [11]
• 1976: Viking probes arrived at planet Mars [9]
• 1877: Discovery of Phobos and Deimos [5]
• 1986: Latest perihelion of comet 1/P Halley [10]
• 1801: Discovery of Ceres (asteroid / dwarf planet) [3]
• 1781: Discovery of Uranus (planet) [2]
• 1838: First successful measurement of a stellar parallax [4]
• 1764: Discovery of the first planetary nebula [1]
• 1943: Discovery of stellar populations [7]
• 1963: First identification of a quasar with an optical source [8]
• 1929: Discovery of the expansion of the Universe [6]

The score of the faultless order is 10 points. The list will be checked pairwise. In each case when a later event precedes an earlier event in your solution, one point will be deducted.