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Scientists say destruction of some comets could be blamed for dimming of star KIC 8462852, instead of some previous theories. In 2011 and 2013, something caused the star to dim by about 25%. Since then, the dimming was mystery for scientists.

Massimo Marengo, physics and astronomy associate professor at Iowa State University, and two other researchers examined infrared data on KIC 8462852 from Spitzer Space Telescope of NASA. They concluded the star’s brightness was dropped due to comet fragments. The findings have been published in the journal Astrophysical Journal Letters.

The researchers said, “The scenario invoking the fragmentation of a family of comets on a highly elliptical orbit is instead consistent with the lack of strong infrared excess found by our analysis”.

Earth’s weather in 2015 is breaking the annual heat record due to global warming and a strong El Nino, as per a report of the World Meteorological Organization (WMO) released on Wednesday.

The bird report on 2015 of the specialized agency of the United Nations proclaimed this year is the hottest on record, which means the weather has broken previous year’s record. The report has been released before the end of 2015 because the planet has been so extraordinarily hot.

The report by WMO has been released just few days before 2015 United Nations Climate Change Conference in Paris. World leaders will gather in Paris to discuss plans to fight climate change.

Scientists said they have decoded the long-standing mystery of missing carbon on the Red Planet. A thin layer of CO2 has covered Mars, which is the reason atmosphere of the planet is dry and cold. But situation wasn’t same many years ago, according to the scientists.

Long time ago, the second smallest planet in the solar system was warm and wet. Scientists revealed ultraviolet (UV) rays from the sun caused the planet’s atmosphere to lose carbon dioxide. The solar winds made Mars and arid planet, the scientists explained. The process is not over yet as solar winds are still removing significant amount of atmospheric carbon dioxide.

Human immunodeficiency virus (HIV) can be prevented just by taking a daily pill, but a few numbers of individuals actually take it. A report of the Centers for Disease Control and Prevention (CDC) stated that more than one million people in the United States are at risk for HIV, but a daily pill of Truvada could prevent against the infection.

Some studies showed that men, who have sex with men, took pre-exposure prophylaxis (PrEP) and reduce their chances of contracting HIV by more than 90%. PrEP has been found reducing risk of HIV by over 70%, as per the studies.

Jonathan Mermin of the CDC said PrEP has been proven beneficial, but still, just 21,000 individuals are currently taking PrEP. No more than 1% people are availing the benefits, and it’s surprising, said Mermin.

After eating for a while you tend to start feel full and you do not want to eat more. But researchers, through a new study, have found it is not your inner feeling of being full rather it is your gut bacteria that signals brain that it has had enough nutrients to reach their goal.

According to study researchers, almost after 20 minutes of continuous eating, E. coli bacteria, which are commonly found in human gut, starts producing proteins that scientists say are connected to a hormone responsible to suppress hunger.

Researchers, through a recent study, have found that babies born in hospitals in England at weekends have higher death risk as compared to babies that were born on weekdays.

The researchers found that mothers of babies born on weekends are also more likely to develop infections. Study lead author Dr. Paul Aylin, of Imperial College London's School of Public Health, said, “More work needs to be done to better understand the causes of these differences, so that steps can be taken to improve outcomes for mothers and babies”.

The study published in the journal BMJ, Aylin's team analyzed data from 675,000 births at English National Health Services hospitals from April 2010 through March 2012. They found that 4,500 babies died within seven days of birth.