world development and scientific research

  What exactly is a terrestrial planet? Terrestrial, or rocky, planets include Earth, Mars, Mercury, and Venus in our solar system. Terrestrial planets are those outsides of our solar system that range in size from half to twice the radius of Earth, and some may be even smaller. Super-Earths are exoplanets that are twice as big as Earth and larger. Earth-sized and smaller terrestrial planets are rocky worlds made of rock, silicate, water, and/or carbon. It requires more research to discover whether some of these worlds contain atmospheres, oceans, or other indications of habitability. Super-Earths are larger terrestrial exoplanets that are at least twice as massive as Earth. Learn about some planets that are on Earth. TRAPPIST-1 e                                     TRAPPIST-1 d Terrestrial planets typica...

  Gaseous worlds similar to Neptune that are about Neptune's size                                    A Neptunian planet is what? Neptunian exoplanets resemble our solar system's Neptune or Uranus in size. (Neptune has a radius almost four times that of Earth and a mass nearly 17 times that of Earth.) The interiors of Neptunian exoplanets could vary, but they are all likely to be rocky with heavy metals in their cores. The atmospheres of Neptunian planets are often dominated by hydrogen and helium. Mini-Neptunes, planets that are larger than Earth but smaller than Neptune, are also being found. In our solar system, there are no planets like these. Discover some planets that resemble Neptune. HAT-P-26_b                  ...

  A gas giant is what? A massive planet primarily made of helium and/or hydrogen is referred to as a gas giant. These planets feature swirling gases atop a solid core rather than hard surfaces, similar to Jupiter and Saturn in our solar system. Exoplanets that are gas giants can be far bigger than Jupiter and orbit their stars much more closely than any planets in our solar system. Our knowledge of the formation and evolution of planets for the most of human history was based on the eight (or nine) planets in our solar system. But during the past 25 years, more than 4,000 exoplanets, or planets outside our solar system, have been found, and this has completely transformed everything. Helium and/or hydrogen make up the majority of gas giants in our solar system, such as Jupiter and Saturn. "Hot Jupiters" are gas giants that are located closer to their stars. Within these broad groups is much diversity. For example, hot Jupiters, which are gas giants like Jupiter but orbi...