This is something you hear said so often - that we risk being hit by an asteroid that could make humans extinct. But do we really? This is the article I’m commenting on, a recently breaking news story: Earth woefully unprepared for surprise comet or asteroid, Nasa scientist warns. Some are already worrying that it means that we are all due to die in the near future from an asteroid impact. Well, no, it doesn't mean that. So, what is the truth behind it? 

The source of all this is a comment by Dr Joseph Nuth who warns:

I had previously discussed the amplitude of the ~0.88-day signal of Boyajian's star (or KIC 8462852.) If you look at the amplitude series alongside gradual dimming of the star throughout the Kepler mission (Montet and Simon, 2016), it appears there's a relationship, even though amplitude changes are real and not an artifact of dimming. Montet dimming is thought to be very unique to Boyajian's star. It follows that if the 0.88-day signal is independent of major dips, our peculiar star happens to be affected by two unique but independent mechanisms.
Data visualization is a key tool in Data Science. You should always look at your data. Invariably, you will discover aspects of the data you might not notice if you just blindly run algorithms on it. That said, another important rule of thumb in Data Science is that you should not only rely on what you think you are seeing. You should always follow up and confirm any graphical analysis with Math.
The giant planets in our solar system have very diverse rings. Observations show that Saturn’s rings are made of more than 95% icy particles, while the rings of Uranus and Neptune are darker and may have higher rock content. Since the rings of Saturn were first observed in the 17th century, investigation of the rings has expanded from earth-based telescopes to spacecraft such as Voyagers and Cassini. However, the origin of the rings was still unclear and the mechanisms that lead to the diverse ring systems were unknown.

If Elon Musk and Robert Zubrin have their way, we may get migrations of hopefuls setting off from Earth to Mars to colonize what they believe to be a "New World". If so, what they find there will be far more like the nineteenth century Antarctica than the seventeenth century "New World". Indeed, even the climbers who tackled Mount Everest in the twentieth century explored a far more hospitable place than Mars. You could breathe the air on the summit with only the need for an oxygen mask. It's also bitterly cold on Mars - a night in the Martian tropics is colder than the coldest night on Everest in the middle of winter. It's so cold that the air often starts to freeze out as dry ice at night.

[Update 11/12/2016: Is it all an optical illusion? Read the follow-up.]

[Update 11/7/2016: Visually, fast drops in a time series, like those of D140 and D260, will tend to appear to squash any noise and periodicity. For that reason, analysis of presence of periodicity needs to be mathematical.]

The recent crash of the ExoMars Schiaperelli lander on Mars highlights how difficult it is to land there. So why is that? Why are landings on Mars so complex? And why do they fail so often? ESA is getting somewhat bad press for this. In my view it validates the foresight of their approach, to send a test lander first. It also highlights the risk for manned missions to Mars and the planetary protection issues with humans to the Mars surface, which I've written about many times.

Since President Kennedy, the Pesident by tradition sets long term objectives for human spaceflight for NASA. President Bush's vision was a return to the Moon. President Obama's vision treats the Moon as of so little interest, that the next step on the way to their long term goal of Mars is to pluck a boulder from an asteroid to create a new moonlet orbiting the Moon for astronauts to visit. With a new President, there is often a change of human space flight policy. The Moon is far more scientifically interesting than we realized at the time of Apollo, not only more interesting than a boulder from an asteroid, as we will see, you could go as far as to say that the level of science interest for the Moon is not dissimilar from that of Mars.

Mars' largest moon, Phobos, has captured public imagination because the dominant feature on its surface (22-kilometers across) is Stickney crater (9-km across), a mega crater that spans nearly half the moon. 

The crater lends Phobos a physical resemblance to the planet-destroying Death Star in the film "Star Wars." But over the decades, understanding the formation of such a massive crater has proven elusive for researchers. For the first time, physicists at Lawrence Livermore National Lab have demonstrated how an asteroid or comet impact could have created Stickney crater without destroying Phobos completely. The research, which also debunks a theory regarding the moon's mysterious grooved terrain, was published in Geophysical Review Letters.

President Obama, if you love science,
 Please protect Mars life from contamination from Earth
For Future of Exobiology - MOON FIRST