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Currently most of the objects of mass between 10 9 kg to 10 12 kg (less than 1000 teragrams (Tg)) listed here are near-Earth asteroids (NEAs). The Aten asteroid 1994 WR12 has less mass than the Great Pyramid of Giza, 5.9 × 10 9 kg. For more about very small objects in the Solar System, see meteoroid, micrometeoroid, cosmic dust, and ...
Shown is the "period life expectancy" at birth. This is the average number of years a newborn would live if age-specific mortality rates in the current year were to stay the same throughout its life. The data is taken from the 2020, 2021/2022 and 2023/2024 United Nations World Population Prospects.
There are eight planets within the Solar System; planets outside of the solar system are also known as exoplanets . As of 27 June 2024, there are 5,678 confirmed exoplanets in 4,231 planetary systems, with 952 systems having more than one planet. [1] Most of these were discovered by the Kepler space telescope.
The number of dwarf planets in the Solar System is unknown. Estimates have run as high as 200 in the Kuiper belt and over 10,000 in the region beyond. However, consideration of the surprisingly low densities of many large trans-Neptunian objects, as well as spectroscopic analysis of their surfaces, suggests that the number of dwarf planets may be much lower, perhaps only nine among bodies ...
Planetary mass. In astronomy, planetary mass is a measure of the mass of a planet -like astronomical object. Within the Solar System, planets are usually measured in the astronomical system of units, where the unit of mass is the solar mass ( M☉ ), the mass of the Sun. In the study of extrasolar planets, the unit of measure is typically the ...
The first report of an exoplanet within this range was in 1998 for a planet orbiting around Gliese 876 (15.3 light-years (ly) away), and the latest as of 2024 is one around GJ 1289 (27.3 ly). The closest exoplanets are those found orbiting the star closest to the Solar System, which is Proxima Centauri 4.25 light-years away.
All exoplanets orbit around star A in the binary system. 47 Ursae Majoris: Ursa Major: 10 h 59 m 27.97 s +40° 25′ 48.9″ 5.10: 46: G0V: 1.029: 5892: 7.434: 3: Planet Taphao Thong was discovered in 1996 and was one of the first exoplanets to be discovered. The planet was the first long-period extrasolar planet discovered. The other planets ...
Crude birth rate refers to the number of births over a given period divided by the person-years lived by the population over that period. It is expressed as number of births per 1,000 population. The article lists 233 countries and territories in crude birth rate. The first list is provided by Population Reference Bureau.