Lunar eclipses can be predicte d (预测) far in advance, both Since the earth an d the moon shine only by time an d location. Similar calculations c the reflecte d light of the sun, each casts (投射) a shadow into space in the direction away from determine the time an d place of...
Scientists say a vaccine for COVID-19 is unlikely to be ready this year, although clinical trials have already started. The first Ebola vaccine was approved in the US in , while scientists suggest that a vaccine for COVID-19 is unlikely to be ready this year. Coin flip A coin is heads...
But beyond this, total eclipses possess a second more compelling beauty in the eyes of us scientists ... for they offer a unique opportunity for research. Only during an eclipse can we study the corona and other dim things that are normally lost in the sun"s glare....