7 million years to get there."可知,K2- 18b距离地球太远了。 故选B项。 11. B 推理判断题。根据第二段中的“It orbits a type of star known as a red dwarf, taking 33 days to complete a circuit (so a year on K2-18b is about as long as a month on Earth).”可知,地球上的一个...
The finding isn't yet certain, and it only indirectly supports the notion that the planet harbours life, but it is the strongest sign yet that we are not alone in the universe.The building blocks for life are thought have been brought to Earth by asteroids that bombarded our planet long ...
Thanks to this pro-gram many children are getting the (25) ___ theyneed all year long. 笔试部分(共95分) Ⅰ. 单项选择 (15分) ( ) 26.Yesterday the teacher told us that the earth ___around the sun. A. moved B. moves C. ...
Modelling suggests that there could be 300 million planets or moons in our galaxy alone with conditions suitable for life.That's 300 million opportunities for biology to get going.And if the right conditions are sustained, then there may have been time for intelligent life to evolve, too.Astron...
The building blocks for life are thought have been brought to Earth by asteroids that bombarded our planet long ago.But the amino acids that form proteins, the ring-shaped molecules that make up DNA and other organic compounds are just chemistry.It's in the oceans of the early Earth that ...