Read the text and Complete the sentences with the correct form of the word in CAPITALS. A new study published in the journal Science shows definitive evidence of organic matter on the surface of Mars. The data was collected by NASA's nuclear-powered rover Curiosity. It confirms earlier findings that the Red Planet once contained carbon-based compounds. These compounds – also called organic molecules – are essential ingredients for life as scientists understand it.
The organic molecules were found in Mars's Gale Crater, a large area that may have been a watery lake over three billion years ago. The rover encountered traces of the molecule in rocks extracted from the area. The rocks also contain sulfur, which scientists speculate helped preserve the organics even when the rocks were exposed to the harsh radiation on the surface of the planet. Scientists are quick to state that the presence of these organic molecules is not sufficient evidence for ancient life on Mars, as the molecules could have been formed by non-living processes. But it's still one of the most astonishing discoveries, which could lead to future revelations. Especially when one considers the other startling find that Curiosity uncovered around five years ago. The rover analyses the air around it periodically, and in 2014 it found the air contained another of the most basic organic molecules and a key ingredient of natural gas: methane. One of the characteristics of methane is that it only survives a few hundred years. This means that something, somewhere on Mars, is replenishing the supply. According to NASA, Mars emits thousands of tons of methane at a time. The level of methane rises and falls at seasonal intervals in the year, almost as if the planet is breathing it. NASA suspects the methane comes from deep under the surface of the planet. The variations in temperature on the surface of Mars cause the molecule to flow upwards at higher or lower levels. For example, in the Martian winter the gas could get trapped in underground icy crystals. These crystals, called clathrates, melt in the summer and release the gas. However, the source of the methane is still a complete mystery. The world of astrobiology considers both of these studies as historical milestones. According to this information, Mars is not a dead planet. On the contrary, it is
quite active and may be changing and becoming more habitable. Of course, this means further research is necessary. Scientists say they need to send new equipment to Mars, equipment that can measure the air and soil with more precision. There are already missions underway. The European Space Agency's ExoMars ship lands in 2020 and will be able to drill into the ground on Mars to analyse what it finds. Additionally, NASA is sending another Mars Rover in the same year to collect samples of Martian soil and return them to Earth. The possibility of life on Mars has fascinated humans for generations. It has been the subject of endless science-fiction novels and films. Are we alone in the universe or have there been other life forms within our Solar System? If the current missions to the Red Planet continue, it looks as if we may discover the answer very soon.
1. The vehicle works using a pair of large powered batteries. SUN
2. The data is not to prove the existence of life. SUFFICE
3. The shook the science world. REVEAL
4. It's far too early to reach any conclusions. DEFINITE
5. This tool measures tiny in temperature exact . PRECISE
6. The rover can pick up tiny samples with exact . PRECISE
7. We are going to analyse the back at the lab. FIND
8. This process is observed in all , from plants to animals. ORGANIC
In those days people usually built houses of wood. Sometimes there were fires in the city, but they were usually very small. 1666 was the year of the Great Fire of London. It started in the house of the king's baker. The fire burnt until Thursday. Many houses in London were burnt. The fire burnt for four days. More than 250 thousand people didn't have home any more.
Collecting stamps is easy and interesting. It is real fun. You begin to learn many facts about history and famous people when you start to collect stamps
My best friend, Alice, is a collector too. She is fond of collecting badges.
My grandfather collected coins when he was a boy. Som people collect dolls. My aunt does. When she travels, she always brings home dolls from different countries.
But collecting things is not the only hobby people have. Some people are fond of travelling or gardening. Very many boys and girls are fond of sport and that is their hobby