years nt a time Certainly if humanity is serious about putting people on Mars, how to feed astronauts with food full of nutrition that doesn't spoil and tastes good is an important and difficult mystery.24. What is the second paragraph mainly about? A. The taste of man-mrade mear B. ...
答案(1)planets(2)earth(3)environment (4)Scientists(5)system (6)yet 解析 (1)句意:火星是我们太阳系行星之一。 planet,n,星球。 beone of译为是… …之一,后面加可数名词复数。 (2)句意:月球离地球多远?earth,n,地球,moon为月球。 how far用来询问距离。 (3)句意:每个人都需要一个无污染的环...
A 1,000-day trip to Mars has the potential to result in a 40 percent chance of the astronaut developing cancer after returning to Earth — not necessarily something a lot of people are looking for when interviewing for a job [source: NASA Science]. Keep in mind, too, that if Terry ...
bottled water industry was worth $94 billion, even with the rise of popular reusable water bottle brands. Oscar Wong / Getty Images For a natural resource that most of us have access to for minimal cost, water is doing pretty well as a revenue generator. Bottled water is a $94 billion...
Mars:Mars is the fourth planet from the Sun in our solar system, which makes it one of Earth's closest neighbors. It's located about 141.6 million miles from the Sun.Answer and Explanation: The distance between Mars and Earth changes as both planets complete their orbits around the Sun. ...
Or perhaps we will leave Mars as we found it.Today, Mars is a frozen world. The average temperature here is lower than at the Earth's South Pole. But long ago, when water may have flowed here, it must have been warmer. We don't know why Mars turned so cold, but perhaps it ...
Transportation will be much better. In the future, spacecrafts will travel very fast.Humans need food and water to live. Scientists will be able to find plants that can grow on Mars. These plants will give us food.2.We may easily jump too high and fly slowly away into space. So we ...
Did you ever wonder how much water is on Earth? Yes, the oceans cover about 71 percent of the Earth's surface. But, volume is a concept that is hard to grasp.
The Impact of Space Farming Astronauts C. Michael Foale (left) and Alexander Kaleri, part of the Expedition 8 crew aboard the ISS, pose next to the Lada greenhouse. Photo courtesy NASA Though much of the research conducted by NASA and other space agencies is important to the space progr...
The rover collected exciting rock samples on the first leg of its epic journey. Next, it will turn towards an ancient river delta to look for past life. By Alexandra Witze During its first Earth year on Mars, the Perseverance rover has used its sampling arm to collect rock cores and explo...