MoscowMoscow (ˈmɒskoʊ , US chiefly ˈmɒskaʊ ; Москва) is the capital and largest city of Russia. The city stands on the Moskva River in Central Russia, with a population estimated at 13.0 million residents within the city limits, over 18.8 million residents in the urban area, and over 21.5 million residents in the metropolitan area. The city covers an area of , while the urban area covers , and the metropolitan area covers over .
Stellar evolutionStellar evolution is the process by which a star changes over the course of time. Depending on the mass of the star, its lifetime can range from a few million years for the most massive to trillions of years for the least massive, which is considerably longer than the current age of the universe. The table shows the lifetimes of stars as a function of their masses. All stars are formed from collapsing clouds of gas and dust, often called nebulae or molecular clouds.
TurkmenistanTurkmenistan (tɜːrkˈmɛnᵻstæn or ˌtɜːrkmɛnᵻˈstɑːn; Türkmenistan, tʏɾkmønʏˈθːɑːn) is a landlocked country in Central Asia bordered by Kazakhstan to the northwest, Uzbekistan to the north, east and northeast, Afghanistan to the southeast, Iran to the south and southwest and the Caspian Sea to the west. Ashgabat is the capital and largest city. It is one of the six independent Turkic states. The population is about seven million (according to the 17 December 2022 Census) and is thus the lowest of the Central Asian republics, and Turkmenistan is one of the most sparsely populated nations in Asia.
TashkentTashkent (tæʃˈkɛnt, USalsotɑːʃ-; ) or Toshkent (tɒʃˈkɛnt; Тошкент / تاشکند, tɒʃˈkent), historically known as Chach, is the capital and largest city of Uzbekistan. It is the most populous city in Central Asia, with a population of 3 million. It is located in northeastern Uzbekistan, near the border with Kazakhstan. Tashkent comes from the Turkic tash and kent, literally translated as "Stone City" or "City of Stones". Before Islamic influence started in the mid-8th century AD, Tashkent was influenced by the Sogdian and Turkic cultures.
Stellar nucleosynthesisStellar nucleosynthesis is the creation (nucleosynthesis) of chemical elements by nuclear fusion reactions within stars. Stellar nucleosynthesis has occurred since the original creation of hydrogen, helium and lithium during the Big Bang. As a predictive theory, it yields accurate estimates of the observed abundances of the elements. It explains why the observed abundances of elements change over time and why some elements and their isotopes are much more abundant than others.
