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A-type star In the Harvard spectral classification system, a class of main-sequence star having spectra dominated by Balmer absorption lines of hydrogen. Stars of spectral class A are typically blue-white or white in color, measure between 1.4 and 2.1 times the mass of the Sun, and have surface temperatures of 7,600–10,000 kelvin.
Space exploration also gives scientists the ability to perform experiments in other settings and expand humanity's knowledge. [67] Another claim is that space exploration is a necessity to humankind and that staying on Earth will eventually lead to extinction. Some of the reasons are lack of natural resources, comets, nuclear war, and worldwide ...
The year 2024 had major space events including a total solar eclipse and historic moon landing. There were moments, though, that reminded us how challenging space exploration can be.
Spaceflight (or space flight) is an application of astronautics to fly objects, usually spacecraft, into or through outer space, either with or without humans on board. Most spaceflight is uncrewed and conducted mainly with spacecraft such as satellites in orbit around Earth , but also includes space probes for flights beyond Earth orbit.
Space colonization has been seen as a relief to the problem of human overpopulation as early as 1758, [87] and listed as one of Stephen Hawking's reasons for pursuing space exploration. [88] Critics note, however, that a slowdown in population growth rates since the 1980s has alleviated the risk of overpopulation. [87]
Space research is scientific study carried out in outer space, and by studying outer space. From the use of space technology to the observable universe , space research is a wide research field . Earth science , materials science , biology , medicine , and physics all apply to the space research environment.
"Space weather describes the conditions in space that affect Earth and its technological systems. Our space weather is a consequence of the behavior of the Sun, the nature of Earth's magnetic field, and our location in the Solar System." [31] Space weather exerts a profound influence in several areas related to space exploration and development.
Recent space exploration has proceeded, to some extent in worldwide cooperation, the high point of which was the construction and operation of the International Space Station (ISS). At the same time, the international space race between smaller space powers since the end of the 20th century can be considered the foundation and expansion of ...