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2. List of possible dwarf planets - Wikipedia

   en.wikipedia.org/wiki/List_of_possible_dwarf_planets

   The number of dwarf planets in the Solar System is unknown. Estimates have run as high as 200 in the Kuiper belt [1] and over 10,000 in the region beyond. [2] 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 ...

3. Habitable zone - Wikipedia

   en.wikipedia.org/wiki/Habitable_zone

   The planet has 6.9 Earth masses and 1.8–2.4 Earth radii, and with its close orbit receives 40 percent more stellar radiation than Earth, leading to surface temperatures of about 60° C. [144] [145] [146] HD 40307 g, a candidate planet tentatively discovered in November 2012, is in the circumstellar habitable zone of HD 40307. [147]

4. Planet-hosting star - Wikipedia

   en.wikipedia.org/wiki/Planet-hosting_star

   Based on this, it is estimated that about 20% of Sun-like stars have at least one giant planet, whereas at least 40% may have planets of lower mass. [ 5 ] [ 7 ] [ 8 ] A 2012 study of gravitational microlensing data collected between 2002 and 2007 concludes the proportion of stars with planets is much higher and estimates an average of 1.6 ...

5. Arizona - Wikipedia

   en.wikipedia.org/wiki/Arizona

   Arizona is the sixth largest state by area, ranked after New Mexico and before Nevada. Of the state's 113,998 square miles (295,000 km 2 ), approximately 15% is privately owned. The remaining area is public forest and parkland, state trust land and Native American reservations.

6. Pennsylvania - Wikipedia

   en.wikipedia.org/wiki/Pennsylvania

   Pennsylvania. Pennsylvania ( / ˌpɛnsɪlˈveɪniə / ⓘ PEN-sil-VAY-nee-ə, lit. 'Penn's forest country' ), officially the Commonwealth of Pennsylvania[ b] ( Pennsylvania Dutch: Pennsylvanie ), [ 7] is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States.

7. Projections of population growth - Wikipedia

   en.wikipedia.org/wiki/Projections_of_population...

   1. World population growth 1700–2100, 2022 projection. Population projections are attempts to show how the human population statistics might change in the future. [ 1] These projections are an important input to forecasts of the population's impact on this planet and humanity's future well-being. [ 2] Models of population growth take trends ...