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aplanatic    
等光程; 不晕的

等光程; 不晕的

aplanatic
adj 1: free from or corrected for spherical aberration; "an
aplanatic mirror"


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  • The Evolutionary History of the Animal Kingdom | Biology I
    The time before the Cambrian period is known as the Ediacaran period (from about 635 million years ago to 543 million years ago), the final period of the late Proterozoic Neoproterozoic Era (Figure 1) It is believed that early animal life, termed Ediacaran biota, evolved from protists at this time
  • Humans make up just 0. 01% of Earths life - Our World in Data
    Livestock outweighs wild mammals and birds ten-fold Humans comprise a tiny share of life on Earth — 0 01% of the total and 2 5% of animal biomass (animal biomass is shown in the right-hand box on the visualization above)
  • Timeline of extinctions in the Holocene - Wikipedia
    The following list is incomplete by necessity, since the majority of extinctions are thought to be undocumented, and for many others there isn't a definitive, widely accepted last, or most recent record According to the species-area theory, the present rate of extinction may be up to 140,000 species per year [1]
  • Diversity begets diversity in mammal species and human . . .
    The asymmetrical geographic distribution of life on Earth is often described by the latitudinal gradient of biodiversity 1,2,3,4,5,6,7,8,9,10,11 Across many taxa, including mammals, birds
  • The fact that there was never a land bridge between Australia . . .
    Asian placental mammals and Australian marsupial mammals have not been in contact in the last several million years (T Douglas Price and Gary M Feinman, Images of the Past) The fact that there was never a land bridge between Australia and mainland Asia is evidenced by the fact that the animal species in the two areas are very different
  • Sea Turtles - Smithsonian Ocean
    Next in the existing evolutionary timeline is Odontochelys semitestacea, a toothed turtle that lived 220 million years ago and was discovered in 2008 Not only is this turtle believed to be the first species to venture into the marine world, but it is also a key specimen in the discovery of how the turtle’s shell evolved
  • Mammals’ Time on Earth Is Half Over, Scientists Predict
    A new model suggests that in 250 million years, all land will collide into a supercontinent that boosts warming and pushes mammals to extinction By Carl Zimmer It’s been about 250 million years





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