☰ Contents · Astronomy

Elements of astronautics: history and rocket motion

Lessons 63–64 · 2 lessons · M. Mamadazimov. Astronomy Grade 11, 1st edition. DAVR NASHRIYOTI, Tashkent, 2018
63

The subject of astronautics and its links with other sciences

Textbook: pp. 134–137
GoalKnow the subject of astronautics, its main milestones (1957 Sputnik 1, 1961 Gagarin, 1969 Moon landing) and current directions.
New words
astronautics · kosmonavtikaartificial satellite · sun’iy yo‘ldoshspace station · kosmik stansiyaorbit · orbita
Explanation

Astronautics is the theory and technology of flight for exploring and using outer space. The theoretical basis was laid by K. E. Tsiolkovsky (1903, the rocket-motion formula); in 1926 R. Goddard launched the first liquid-fuel rocket; led by S. P. Korolev, the first artificial satellite, Sputnik 1, was put into orbit on 4 October 1957, and on 12 April 1961 Yuri Gagarin became the first cosmonaut, circling the Earth once in Vostok 1 (108 minutes). On 20 July 1969 the Apollo 11 astronauts landed on the Moon. Later stages: orbital stations (Salyut, Mir), the International Space Station (first module 1998, continuously crewed since November 2000), the Voyager probes (1977), the Hubble telescope (1990), Mars rovers. Current directions: reusable rockets (SpaceX Falcon 9, first booster landing in 2015), commercial flights, China’s Tiangong station, programmes to return to the Moon (Artemis, Chandrayaan-3 in 2023). Astronautics has entered everyday life through communication, navigation (GPS), weather and Earth-observation satellites.

Worked examples
Sputnik 1’s orbital period was ≈ 96 minutes: it circled the Earth 1440 : 96 = 15 times a day.
From the first satellite to 2026: 2026 – 1957 = 69 years; from Gagarin’s flight: 2026 – 1961 = 65 years.
Class activity

Make a poster of the chronology of astronautics (1903 Tsiolkovsky, 1926 Goddard, 1957, 1961, 1969, 1998, 2015, 2023) with one sentence for each event.

Practice
1
When was the first artificial satellite launched and what was it called?
2
A satellite’s period is 90 minutes. How many orbits a day? (1440 : 90)
3
What is the significance of 12 April 1961?
4
Where does astronautics appear in our daily life? Give two examples.