Sunspot - Wikipedia
Sunspot number also changes over long periods. For example, from 1900 to the 1960s, the solar maxima trend of sunspot count was upwards; for the following decades it diminished. However, the Sun was last as active as this period over 8,000 years ago.
Top 10 Extreme Planet Facts - Space.com
Our solar system's planets vary greatly in size, composition, temperature, chemistry and geology. Here are some notable extreme facts about the planets that orbit our Sun.
Star - Life Cycle & Special Characteristics of the Stars ...
A star is a large mass of plasma matter held together by gravitational forces. Near the end of its life a star can also have a significant portion of degenerate matter. Sun is the star nearest Earth. At night other stars become visible when not obscured by the Sun’s light or atmospheric interference. In the […]
Kapteyn b: Habitable-zone Exoplanet or Illusion?
Recent research casts doubt on whether nearby Kapteyn b, a supposed super-Earth circling in its star’s habitable zone, is a planet at all. If the nearby exoplanet Kapteyn b exists, it would be ...
Planet Hunters: Archive
About this Project. The Zooniverse is the world’s largest platform for people-powered research. This research is made possible by hundreds of thousands of people around the world who come together to assist professional researchers.
Star - Wikipedia
The concept of a constellation was known to exist during the Babylonian period. Ancient sky watchers imagined that prominent arrangements of stars formed patterns, and they associated these with particular aspects of nature or their myths.
Sun Has Likely Entered New Evolutionary Phase ... - Forbes
Opinions expressed by Forbes Contributors are their own. I cover over-the-horizon technology, aerospace and astronomy. The Sun has likely already entered into a new unpredicted long-term phase of ...
Cosmic ray | physics | Britannica.com
Cosmic ray: Cosmic ray, a high-speed particle—either an atomic nucleus or an electron—that travels through space. Most of these particles come from sources within the Milky Way Galaxy and are known as galactic cosmic rays (GCRs). The rest of the cosmic rays originate either from the Sun or, almost certainly in
Eclipse - Eclipsing binary stars | Britannica.com
Eclipse - Eclipsing binary stars: Astronomers have estimated that more than half of all stars in the Milky Way Galaxy are members of a double or a more complex multiple star system. Most of these are too far from Earth for the individual stars to be resolved. In a double star, or binary, system (see binary star), each star attracts the other gravitationally and orbits about a unique point, the ...
Gigante vermelha – Wikipédia, a enciclopédia livre
Uma gigante vermelha é uma estrela gigante luminosa de massa pequena ou intermediária (entre 0,5 e 10 massas solares), numa fase avançada da evolução estelar.A atmosfera exterior é inflada e tênue, fazendo com que o raio seja imenso e a temperatura superficial seja baixa (abaixo de 5000 K). A aparência da gigante vermelha é de amarelo-laranja a vermelha, incluindo os tipos espectrais ...