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主題: Looking for the Shadows of Trees On Exoplanets to Detect Multicellular Life 作者: peter 於 2020-10-07 12:02:19 https://www.universetoday.com/148164/heres-a-clever-idea-looking-for-the-shadows-of-trees-on-exoplanets-to-detect-multicellular-life/
The new study is titled “Distinguishing multicellular life on exoplanets by testing Earth as an exoplanet.” (https://www.universetoday.com/wp-content/uploads/2020/10/Crater-and-Trees.png) This figure from the study shows A: the crater field used for Apollo astronaut training as seen in 1967. B: An example of UAV flyover measuring NDVI at 5 am in 2018 with a current Google Earth image as a background image. C: Closeups of both a tree and a crater in NIR at different times of the day. The key finding is that while the crater produces a shadow at 5 am only, the tree produces a shadow throughout the day. Image Credit: Doughty et al, 2020. |