Astronomy Now – Page 139

Dione: a moon of contrasts

22 August 2016 Astronomy Now

In this image from NASA’s Cassini spacecraft, Saturn’s moon Dione reveals its past via contrasts. The features visible here are a mixture of tectonics — the bright, linear features — and impact cratering — the round features, which are spread across the entire surface.

Astronomers identify a young heavyweight star in the Milky Way

22 August 2016 Astronomy Now

Researchers have identified a young star, located almost 11,000 light-years away, which could help us understand how the most massive stars in the universe are formed. This star, already more than 30 times the mass of our Sun, is still in the process of gathering material from its parent molecular cloud, and may be even more massive when it finally reaches adulthood.

Hubble views starbirth in an irregular galaxy

22 August 2016 Astronomy Now

This NASA/ESA Hubble Space Telescope image captures the glow of distant stars within NGC 5264, a dwarf galaxy located just over 15 million light-years away in the constellation of Hydra (The Sea Serpent). NGC 5264 clearly possesses an irregular shape — unlike the more common spiral or elliptical galaxies — with knots of blue star formation.

Watch the OSIRIS-REx asteroid sample return mission briefing

21 August 2016 Astronomy Now

Watch as NASA holds a news conference at its Washington, D.C. headquarters to provide a preview of its OSIRIS-REx mission to asteroid Bennu and back. The mission is scheduled to launch on 8 September, reach the asteroid in 2018, capture a sample of the celestial body in 2020 and bring the specimen back to Earth in a special landing capsule in 2023.

Mars rover’s panorama of entrance to ‘Murray Buttes’

21 August 2016 Astronomy Now

NASA’s Curiosity Mars rover acquired this 360-degree panorama as it neared features called “Murray Buttes” on lower Mount Sharp on the fourth anniversary of its landing.

Voyager 2 launched today in 1977

20 August 2016 Astronomy Now

On this day in 1977, NASA’s Voyager 2 spacecraft, the first Voyager spacecraft to launch, departed on a journey that would take it to Jupiter, Saturn, Uranus and Neptune and beyond.

Nearby Venus-like exoplanet might have oxygen atmosphere

20 August 2016 Astronomy Now

The distant planet GJ 1132b intrigued astronomers when it was discovered last year. Located just 39 light-years from Earth and orbiting its red dwarf star every 1.6 days, new research shows that despite being baked to a temperature of around 232 °C, GJ 1132b might possess a thin, oxygen atmosphere — but no life due to its extreme heat.

Britain’s pre-Stonehenge megaliths were aligned by astronomers

19 August 2016 Astronomy Now

For the first time, astroarchaeologists have statistically proven that the earliest standing stone monuments of Britain — the great circles — were constructed specifically in line with the movements of the Sun and Moon, 5000 years ago. University of Adelaide researchers used innovative 2-D and 3-D technology to test the patterns of alignment in the standing stones.

Supernova ejected from the pages of history

18 August 2016 Astronomy Now

A new look at the debris from an exploded star in our galaxy has astronomers re-examining when the supernova actually happened. Recent observations of the supernova remnant called G11.2-0.3 with NASA’s Chandra X-ray Observatory have stripped away its connection to an event recorded by the Chinese in 386 CE.

Hubble’s fireball

17 August 2016 Astronomy Now

In this NASA/ESA Hubble Space Telescope image we see the central Wolf-Rayet star known as Hen 2-427 — more commonly known as WR 124 — surrounded by the nebula M1-67. Both objects are found in the constellation of Sagitta some 15,000 light-years away. The hot clumps of gas ejected by the star into space are travelling at over 150,000 kilometres per hour.