Surprised scientists say they now have absolute proof that life exists on Jupiter (木星). They’re receiving SOS signals radioed from the destroyed planet! Off the record, NASA higher-ups are analyzing that the signals were caused by the recent strike of Jupiter by comet fragments (彗星碎片).

“Theses signals can only be coming from an intelligent (智慧的) life form,” says Dr. Lucas Mirsch, a highly respected planetary astronomer with close ties to NASA. “Contrary to what we’ve believed for years, we’re not alone in the solar system. And based on what we can tell from the mathematical pattern of these signals, the residents of the largest planet in our galaxy are asking Earth for help.” Dr. Mirsch says NASA officials have absolutely confirmed that Jupiter is the source of the strange signals, which began in late June—just weeks before the comet fragments began to hit the giant planet.

“NASA has investigated every possibility that this could be a hoax,” says Dr. Mirsch. That is, it may be a trick. “State-of-the-art sensors have traced the point of origin to the exact position of Jupiter’s orbit. There’s simply nowhere else they could be coming from.”

One of the specialists who has analyzed the mathematical pattern of the sounds says he and his staff are 99 percent sure the message is an SOS of some sort. “It’s difficult to explain to the public,” said the expert. “But the frequency with which certain numbers occur in a coded message gives us clues about its general content. Although we can’t give an exact word- for-word translation, we can say with reasonable certainty that life-and-death urgency is being communicated.”

NASA won’t officially comment but Dr. Mirsch says, “There’s not much the agency can do to help. All we can do now is pray that Jupiter survives this terrible strike and that our two worlds can make contact again soon.”

At some point in elementary school, your science teacher may explained to you that there are 365 days in a year because that's how long it takes for Earth to complete one full journey around the sun. What they might not have explained, however, is that it's not exactly 365 days—it’s actually closer to 365. 2421 days.

So, if we want our calendar year to begin right when Earth begins a new turn around the sun, we have to account for roughly an extra quarter of a day each year, or one day every four years. History.com reports that the Egyptians had already been doing this for a while before Europe finally caught on in 46 BC, when Roman Emperor Julius Caesar and astronomer Sosigenes put their heads together to come up with what we now call the Julian calendar, which includes 12 months, 365 days, and an additional ''leap day'' every four years on February 29.

But rounding 0.2421 up to 0.25 each year created an issue, because it didn't quite add up to a full day every four years—and that tiny difference meant that after 128 years, the calendar year ended up starting a day before Earth had completed its journey around the sun. By the 14^th century, the calendar year was starting 10 days before Earth finished its orbit.

In 1582, Pope Gregory XIII sought to correct the error by suggesting that we simply skip a leap day every so often. His Gregorian calendar, which we still use today, rules that we skip the leap day during years which can be evenly divided (被整除) by 100 but not by 400. For instance, the year 2000 included a leap day because it can be divided by 100 and 400; the year 2100, on the other hand, will not include a leap day, since it's evenly divided by 100, but not by 400.

Gregory XIII’s correction to Caesar's overcorrection is itself a bit of an under-correction, so we'll probably need to reevaluate our leap day design again in about 10,000 years.

At first sight the planet Mars does not appear very welcoming to any kind of life. It has very little oxygen and water. The temperature at night is below 50 degrees and winds of 100 miles(161 kilometers) per hour cause severe dust storms. However, the surface of the planet seems to show that water flowed across it at some time in the past, and it is believed that there would be enough ice at the poles to cover the planet with water if it melted. Although there is no life on the Mars now, some scientists think there may have been some form of life a long time ago. At that time, the planet had active volcanoes(火山), the atmosphere was thicker and warmer, and there was water. In fact, in some ways the Mars may have been similar to the earth, where life exists.

Some people believe that the Mars could support life in the future if the right conditions were produced.The first step would be to warm the planet using certain gases which trap the sun’s heat in the planet’s atmosphere. With warmth, water and carbon dioxide, simple plants could begin to grow.These plants could slowly make the Mars fit to live on. It is judged that the whole process might take between 100, 000 and 200, 000 years. In the meantime, people could begin to live on the planet in a special closed environment.They would provide a lot of useful information about conditions on the Mars and the problems connected with living there.