1 . It sounds like something from the field of science fiction — a space exploration into vast outer space, heading towards the Red Planet While we’re not quite ready to put a person on it, the question we ask today is:
The space race saw the USSR (the Union of Soviet Socialist Republics) and USA compete to achieve firsts in spaceflight. The USSR released Sputnik 1, an artificial satellite, before anyone else,
However, not everyone agrees. Leading astrophysicist Neil deGrasse Tyson has said the concept of changing habitability of a planet is not always practical.
It seems that the main reason at the moment is the search for alien (外星的) life.
| A．and the US landed on the moon first. |
| B．Instead, it makes no sense when we can simply terraform Earth because of the damage we have done to it. |
| C．One of these could be the survival of our species. |
| D．Why are so many countries interested in going to Mars? |
| E．It has been believed that, at one time, a certain form of life did exist in this red planet. |
| F．Surely inspiring a new generation to visit the stars is reasonable enough. |
| G．May landing on Mars inspire more people to become interested in exploring space? |
NASA has discovered the eighth planet of a star system, similar to our solar system. The star, Kepler-90, is over 2,500 light years away and larger and
The Kepler-90 star system is much more compact (紧凑的) than our solar system. The outermost planet
The newly discovered planet, Kepler-90i, is
The discovery was made on data
The Future Life on Mars
Compared with the life we
Firstly, without pollution on Mars, people will be able to drink cleaner water
Before the mid-2th century,
5 . A new study suggests that dark markings on the planet Mars represent sand — not water. The research in 2015 suggested that lines on some Martian hills were evidence of water. Yet American scientists now say these lines appear more like dry flows of sand. If water is present, it is likely to be a small amount. Water in liquid form would be necessary for microbial (微生物的) life.
NASA, the American space agency, said more research is needed. Michael Meyer is the lead scientist for NASA’s Mars exploration programme. He noted that the latest study does not reject the presence of water. But he admitted, “It just may not be as exciting as the idea of rivers going down the sides of cliffs (悬崖).”
The new findings come from a team led by Colin Dundas of the United States Geological Survey. His team measured 151 of these lines in 10 areas. Most of the lines end with slopes (倾斜) between 28 degrees and 35 degrees. These measurements are similar to active sand dunes (沙丘) on both Mars and Earth. A small covering of dust that moves and sometimes becomes lighter might help explain the markings. They usually appear in the Martian summertime, and then disappear until the next year. If these lines are dry, this suggests that recent Mars bas not had large amounts of liquid water. Dundas and his research team say that many questions remain.
“I still think that Mars has great potential for having had life early on in its history,” Meyer said. “As long as that’s true, we also have a reasonable possibility of life still being on Mars. It just happens to be cryptic or well hidden.”
NASA currently has no robotic — either on Mars or in development — with the ability to climb steep slopes. The lack of such equipment has engineers coming up with ideas like Martian helicopters or planes without pilots.
1. What do American scientists find on Mars now according to their study?| A．A lot of little life. | B．An amount of water. |
| C．Some Martian hills. | D．Dark markings are sand. |
| A．In Martian spring. | B．In Martian summer. |
| C．In Martian autumn. | D．In Martian winter. |
| A．Doubtful. | B．Trustful. | C．Unconcerned | D．Objective. |
| A．Undiscovered. | B．Strange. | C．Magical. | D．Icy. |
1．参加讲座的经历；
2．参加讲座后的心得体会。
注意：
1．词数80左右；
2．可以适当增加细节，以使行文连贯。
参考词汇：讲座lecture
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7 . Studies of Mercury — the planet closest to the sun-show that it has shrunk by about 11 kilometers across since the solar system’s birth 4.5 billion years ago. As the planet cooled and contracted (收缩), its surface had many long curved ridges (山脊) similar to the wrinkles on a bad apple.
A new research on these ridges, called lobate scarps (瓣状陡坡), has found more of them, with steeper faces, than ever before. The discovery suggests that Mercury shrank by far more than the previous estimate, says Paul Byrne, a planetary scientist. The finding helps explain how Mercury’s huge metallic core (中心) cooled off over time. It may also finally settle the differences between theoretical scientists, who had predicted a lot of shrinkage, with observers who had not found evidence of that — until now. “We are resolving a four-decade-old argument here,” Byrne added.
Planetary scientists have been arguing over Mercury’s lobate scarps ever since the Mariner 10 spacecraft flew past the planet three times in 1974-1975. Researchers can use measurements of the length and height of the scarps to calculate how much planetary shrinkage they represent. That shrinkage is a product of Mercury’s strange structure — “like a core floating through space with a thin outer blanket,” says Byrne. Most of the planet is made of that large core, and so it would have cooled rapidly as heat rushed toward its surface.
The latest data, coming from NASA’s MESSENGER probe and covering the entire planet, showed many lobate scarps with sharp steeper faces, Byrne said. It also uncovered details on another kind of surface feature that may be related to shrinkage. These “wrinkle ridges” are less pronounced than the lobate scarps but may also have formed during contraction. Combined, the data on the lobate scarps and the wrinkle ridges suggest that Mercury’s diameter (直径) has shrunk by 11.4 kilometers, Byrne said.
1. How does the author explain the formation of the ridges on Mercury?| A．By making a comparison. | B．By providing some figures. |
| C．By describing the process. | D．By following the order of time. |
| A．It helps explain why Mercury has a huge metallic core. |
| B．It shows Mercury shrinks much less than previously thought. |
| C．It reveals there are less ridges on Mercury than people thought. |
| D．It helps settle the argument between theoretical scientists and observers. |
| A．It’s large core with thin surface. | B．The lobate scarps and wrinkles. |
| C．The pronounced wrinkle ridges. | D．The length and height of the scarps. |
| A．The latest data came from NASA’s Mariner 10 probe. |
| B．The lobate scarps may have formed before Mercury’s contraction. |
| C．The latest data provided supporting evidence of Mercury’s shrinkage. |
| D．The data suggests that Mercury’s diameter has shrunk to 11.4 kilometers. |
On 15 October 1997, the Cassini spacecraft set out on a mission to explore the planet Saturn. So great was the distance from Earth that it
The U.S. space as agency NASA has released the first images captured by the James Webb Space Telescope, the most
One of the images shows some of the first galaxies (星系) ever to form, which means the Webb is seeing the galaxies that existed about 13 billion years ago. Additional
The Webb is the result of a $10 billion, 25-year project led by NASA and supported by other space agencies.
10 . Out-of-control SpaceX Rocket
A SpaceX rocket is now headed directly for the moon after spending almost seven years flying through space, experts say. The rocket was originally launched to send a space weather satellite to the Lagrange point— a gravity-neutral position four times farther than the moon and in direct line with the sun.
At this phase, it did not have enough fuel to return to Earth’s atmosphere. But meanwhile it lacked the energy to escape the gravity of the Earth-Moon system.
As for whether the collision (相撞) could be viewed from Earth, Gray says it will probably go unobserved.” Even if it hit on the near side of the moon, the impact occurs a couple of days after New Moon, which was hardly observable, he added, “to me, the impact was not a big deal.”
| A．So the rocket has been following a somewhat chaotic orbit since. |
| B．Nevertheless, space enthusiasts believe the impact could provide valuable data. |
| C．It was part of SpaceX’s space exploration programme. |
| D．But after completing a long burn of its engines, the rocket’s second phase became a problem. |
| E．The exact spot that the rocket will hit remains unclear. |
| F．The lunar phase reveals the passage of time in the night sky. |
