Astronomy Now – Page 225

Mimas by Saturnshine

14 April 2015 Astronomy Now

Although we are used to seeing Saturn’s moons lit directly by the Sun, sometimes we can catch them illuminated by “Saturnshine.”

Universe expanding more slowly than previously thought?

13 April 2015 Astronomy Now

A University of Arizona-led team of astronomers found that the type of supernovae commonly used to measure distances in the universe fall into distinct populations not recognised before. The findings have implications for our understanding of how fast the universe has been expanding since the Big Bang.

International Dark Sky Week 2015

11 April 2015 Astronomy Now

International Dark Sky Week is an annual worldwide event, held 13th—19th April this year. A key component of Global Astronomy Month, find out what practical measures you can take to help reclaim the stars.

Aurora over Icelandic lake

9 April 2015 Astronomy Now

On 15th March, a coronal mass ejection from the Sun launched a torrent of charged particles in the direction of Earth. The gaseous cloud collided with our planet’s magnetic field two days later, generating this glorious, shimmering auroral curtain over Iceland photographed by Carlos Gauna.

Sun born after the Milky Way’s star-birthing frenzy

9 April 2015 Astronomy Now

Our 5 billion-year-old Sun missed the stellar “baby boom” that erupted in our young Milky Way galaxy 10 billion years ago. During that time the Milky Way was churning out stars 30 times faster than it does today.

A new view of the Moon’s formation

8 April 2015 Astronomy Now

A crucial difference in the isotopic chemical “fingerprints” of Earth and the Moon confirms an explosive, interconnected past when, within the first 150 million years after our Solar System formed, a giant body roughly the size of Mars struck the Earth.

Mars has belts of glaciers composed of water ice

8 April 2015 Astronomy Now

Researchers at the University of Copenhagen have used data from NASA’s Mars Reconnaissance Orbiter combined with computer modelling to determine that Mars has thousands of dust-covered glacier-like formations on the planet’s northern and southern hemispheres.

The seasons of the Sun

8 April 2015 Astronomy Now

A team of researchers has determined that the Sun undergoes a type of seasonal variability with its activity waxing and waning over the course of nearly two years. This behaviour affects the approximately 11-year solar cycle, sometimes amplifying solar storms that can buffet Earth’s atmosphere.

Dawn spacecraft prepares to image dwarf planet Ceres in detail

7 April 2015 Astronomy Now

One month after its capture into orbit around Ceres, NASA engineers working on the Dawn mission state that the spacecraft is performing flawlessly and about to start capturing optical navigation images on April 10th.

Black holes may reveal what lies within

6 April 2015 Astronomy Now

The “information loss paradox” in black holes — a problem that has plagued physics for nearly 40 years, since Stephen Hawking first proposed that black holes could radiate energy and evaporate over time — may not exist, according to University at Buffalo scientists.