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Flight engineer Timothy Kopra and European Space Agency astronaut Timothy Peake will take a spacewalk from the International Space Station (ISS) on Friday starting at 7:55 a.m. EDT (GMT-5). The spacewalk is likely to be of six and a half hours, with the aim of replacing a failed solar array voltage regulator due to which one of the eight power sources of the ISS, named channel 1B, has stopped working. In addition, certain ongoing tasks for installing route power and data cables will also be completed during this spacewalk.

SpaceX, Orbital ATK and Sierra Nevada Corp have been selected by the US space agency NASA to send cargo to the International Space Station (ISS), with the mission likely to begin from 2019, according to a statement released by the agency. At least six uncrewed cargo missions will be bought by the agency from 2019 to 2024 from each of the three companies, according to the agency officials.

Astronomers have discovered a small, bright object in June 2015. The object, which is likely to be a supernova, is being considered the brightest of its kind ever found. The currently-expected supernova has been named the object ASASSN-15lh and has increased the maximum expected limit of exploding stars capabilities. However, the astronomers believe that in case the object is not a supernova, it is likely to be some even more mysterious object.

The skeleton of a mammoth was discovered by a 12-year-old boy around 1,250 miles south of the North Pole in Siberia. The research has revealed that the mammoth is somewhere around 45,000 years old. The great hump on the top of the mammoth is over seven feet high, while multiple cuts and holes were found on its bones that appeared to have been made by spear points or some other weapons of similar kind.

Findings that are going to be published in February in the Journal, The Annals of Thoracic Surgery, suggested that drugs used to decrease cholesterol levels in the blood, statins, seems to be useful to cut cardiac complications in patients who undergo coronary artery bypass grafting (CABG), when taken before and after the operation.

They have apparently shown that risks of dying during and post surgery are likely to be less as compared to when statins aren’t consumed. Besides, the complications that rise post surgery, like atrial fibrillation, can be decreased.

Statins are used to cut cholesterol levels in the blood, which hinder the production of the substance in the liver, while lowering down bad cholesterol levels and raising good cholesterol levels.

In The US, the average age of first-time mothers has reached all-time high, over 26. TJ Mathews of the Centers for Disease Control and Prevention said that the change has come mainly because of a big fall in teen moms. However, more first births to older women have been also tugging the number up.

TJ Mathews is the main author of a report released on Thursday that has placed the average age at 26 years, 4 months for women who delivered their first baby in 2014.

Around 1970, the government started tracking the age of new mothers, and that time the average was 21. Since then, the number has been climbing, and spiked in about previous five years.