安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
|
- Extinction Rates Soar to 1,000 Times Normal (But Theres Hope)
Species on Earth are going extinct at least 1,000 times faster than they would be without human influence, new research finds But there's still time to save the world from this biodiversity
- Drake Equation: Estimating the Odds of Finding E. T. | Space
Then in 2017, seven Earth-sized rocky planets were confirmed around the star TRAPPIST-1, which is only 40 light-years from Earth Some of those planets may be in the habitable zone Some of those
- The abundance, biomass, and distribution of ants on Earth
Adding up our estimates of epigaeic, arboreal, and nonforaging ants (see Materials and Methods), we estimate the number of all ants on Earth at any given time to be 19 8 × 10 15 (±5 × 10 15), i e , ∼20 quadrillion, individuals with a total dry biomass of 12 3 (±3 1) Mt C (Fig 2B)
- Earths lost species only the tip of the iceberg - BBC News
Earth's 'lost species' only the tip of the iceberg Published 5 September 2020 Last year an intergovernmental panel of scientists said one million animal and plant species were now threatened
- Life in the Universe: What are the Odds? - Science@NASA
In recent years, among NASA scientists, such potential signs have acquired an intriguing new name: technosignatures Evidence of a communicative, technological species somewhere among the endless fields of stars could come in the traditional form: signals by radio or optical light waves, or from some other slice of the electromagnetic spectrum
- Which animal group has the most organisms? | AMNH
And the total number of documented species of living organisms at the present time is probably about 2 5 million So insects represent about 40% of all known living species! But that's not the end of the story Scientists estimate that there may actually be somewhere between 10 and 30 million species of insects inhabiting our planet
- How Much Water is There on Earth? | U. S. Geological Survey
They are only small in relation to the size of the Earth This image attempts to show three dimensions, so each sphere represents "volume " The volume of the largest sphere, representing all water on, in, and above the Earth, would be about 332,500,000 cubic miles (mi 3 ) (1,386,000,000 cubic kilometers (km 3 )), and be about 860 miles (about
|
|
|