摘要: Imagine you're an astronaut and are living in space. What can you do to protect yourself and what do you need to survive? Discover how spacesuits work and how astronauts overcome the many challenges of being in space, including eating and drinking....
How do astronauts pollinate plants in space farms? In the absence of bees and other pollinators in space, astronauts manually pollinate plants using small brushes or by shaking the plants to distribute pollen. This ensures that flowering plants can produce fruits and seeds. Can space-farmed plants...
In the free-fall state astronauts orbiting the Earth find themselves in, sweat and tears do not flow downward and instead cling to surfaces and blob together. This can become a major vision problem when sweat and tears form bubbles in the eyes or on eye lashes. Even worse is a potential ...
Astronauts on the space station practise for this by growing lettuce and other food in space. Engineers are developing 3 D printing techniques which could allow future Mars astronauts to build tools as needed.1. Why do many countries want to send astronauts to Mars? A. Because spacecrafts ...
At least two hours each day is spent on exercise. It is necessary to keep the crew healthy. In some ways, living in a space station is like being on a deserted island. A crew of two or three astronauts has to survive far from home for weeks or months. If thei...
When astronauts go up into space, they have to bring a similar environment with them in order to survive -- without it, their bodies would suffer from a complete lack of air and pressure. Space shuttles andspace stationsare filled with the same kind of air found at sea level, and except...
用适当的介词及介词短语完成句子(每题1分)1.-How amazing it is that astronauts are exploring outer space!-It's a challenge, I guess, man against nature.2. Most Americans woul d prefer to keep their problems themselves an d solve their problems themselves.3. Everybody was touche d words aft...
We communicate with spacecraft in a lot of different ways. We have a network of antennas all over the world across all seven continents, along with satellites in space that help transmit these radio waves. Astronauts, mission controllers, and scientists rely on this network to transmit messages...
We do it every day, or pay for food that others have prepared. But preparing food in space presents unique challenges at almost every turn. American astronauts eat a combination of rehydrated freeze dried foods, traditional dried foods like jerky and fruit, and some foods that come in ...
But accessing and exploiting Martian water ice and other resources — a process known as In-Situ Resource Utilization (ISRU) — is easier said than done. So experts have begun to strategize what’s needed to allow astronauts to maintain a Martian lifestyle on the Red Planet. Enabling element...