December 2017 – Astronomy Now

See 2018’s largest supermoon on 2 January

31 December 2017 Ade Ashford

If skies are clear in Western Europe on the first evening of 2018, be sure to glance up at the almost full Moon in the constellation of Gemini. If it seems a bit larger than usual then you’d be right, for the lunar orb is at its closest for the year, making the full Moon of 2 January a supermoon.

Giant bubbles observed on red giant star’s surface

29 December 2017 Astronomy Now

Astronomers using ESO’s Very Large Telescope have for the first time directly observed granulation patterns on the surface of a star outside the Solar System — the ageing red giant π1 Gruis.

Arecibo radar returns with asteroid Phaethon images

29 December 2017 Astronomy Now

After several months of downtime since Hurricane Maria struck the island of Puerto Rico, the Arecibo Observatory Planetary Radar has returned to normal operation, providing the highest-resolution images to date of near-Earth asteroid 3200 Phaethon during its December 2017 close approach to Earth.

Astronomers shed light on formation of black holes and galaxies

28 December 2017 Astronomy Now

Stars forming in galaxies appear to be influenced by the supermassive black hole at the center of the galaxy, but the mechanism of how that happens has not been clear to astronomers until now.

New study finds ‘winking’ star may be devouring wrecked planets

28 December 2017 Astronomy Now

A team of U.S. astronomers studying the star RZ Piscium has found evidence suggesting its strange, unpredictable dimming episodes may be caused by vast orbiting clouds of gas and dust, the remains of one or more destroyed planets.

An interview with David Grinspoon

28 December 2017 Astronomy Now

As part of the new Gravity Assist podcast, NASA’s Director of Planetary Science Jim Green interviewed David Grinspoon of the Planetary Science Institute in Arizona about the planet Venus and what makes the second world from the Sun so hellish compared to Earth.

Cosmic filament probes our galaxy’s giant black hole

21 December 2017 Astronomy Now

The centre of our galaxy has been intensely studied for many years, but it still harbors surprises for scientists. A snake-like structure lurking near our galaxy’s supermassive black hole is the latest discovery to tantalise astronomers.

Mars and Earth may not have always been neighbours

21 December 2017 Astronomy Now

A study published in the journal Earth and Planetary Science Letters posits that Mars formed in what today is the Asteroid Belt, roughly one and a half times as far from the Sun as its current position, before migrating to its present location.

Titan drone, comet sampler picked as finalists for NASA mission

20 December 2017 Stephen Clark

NASA has narrowed its choices for a new billion-dollar robotic space mission: A nuclear-powered quadcopter to explore the hazy landscape of Saturn’s largest moon Titan, or a probe to scoop up a piece of a comet and return it to Earth.

See the Moon hide bright star Aldebaran on New Year’s Eve

20 December 2017 Ade Ashford

Observers in the UK with clear skies on the night of 30—31 December 2017 can see the 12-day-old waxing gibbous Moon glide through the Hyades cluster in Taurus, occulting a number of naked-eye stars along the way, culminating in the disappearance and reappearance of first-magnitude star Aldebaran in the small hours of New Year’s Eve.