Astronomy Archives

January 4, 2020January 4, 2020 by Matt Williams

It’s Snowing Iron Near the Earth’s Core

The Earth's layers, showing the Inner and Outer Core, the Mantle, and Crust. Credit: discovermagazine.com

Scientists theorize that within Earth’s interior, conditions are extremely hot and extremely pressurized. This is what allows for the primarily iron and nickel core to be divided between a solid inner region and liquid outer region. The dynamics of this core are believed to be responsible for driving our planet’s protective magnetosphere, which is why scientists are determined to improve their understanding of it.

Thanks to new research conducted by an international team of scientists, it appears that the core region also gets its fair share of “snow”! To put it another way, their research showed that within the outer core, tiny particles of iron solidify and fall to form piles up to 320 km (200 mi) thick on top of the outer core. These findings could vastly improve our understanding of the forces that affect the entire planet.

December 30, 2019December 30, 2019 by Matt Williams

Spaceflight Stories Expected for 2020

Artist concept of NASA’s Space Launch System (SLS) on the left, and the Orion Multi-Purpose Crew Vehicle (right). Credit: NASA

The year two thousand and twenty is almost upon us. And as always, space agencies and aerospace companies all around the world are preparing to spend the coming year accomplishing a long list of missions and developments. Between NASA, the ESA, China, SpaceX, and others, there are enough plans to impress even the most curmudgeonly of space enthusiasts.

December 30, 2019December 30, 2019 by David Dickinson

Top Astronomical Events for 2020

Mars Opposition — Bright yellow Mars approaching a close opposition in July 2018 shines over the waters of Middle Waterton Lake in Waterton Lakes National Park in southwest Alberta on the Alberta-Montana border. Mars is so bright it produces a glitter path on the water. The Milky Way is at right. This was from Driftwood Beach, windy as always this night. The sky is tinted green with bands of airglow, though there was a dim aurora to the north this night as well, quite unexpected. Waterton Lakes is a World Heritage Site and a Dark Sky Preserve. This is a stack of ten exposures for the ground to smooth noise (and blur the wind-rippled water) at f/3.2, and a single exposure for the sky at f/2.2, all 30 seconds with the Sigma 24mm Art lens and Nikon D750 at ISO 6400. Taken July 11/12, 2018 at the end of a 6-hour session training the Dark Sky Guides staff. It was a superb night, with everything to see in the sky.

Ready for another amazing year of sky watching and astronomy in 2020? Hard to believe, were already a fifth of the way into the 21^st century. 2020 rounds out the final year of the second decade, promising an amazing year of skywatching to come.

December 26, 2019December 26, 2019 by David Dickinson

Waiting for Betelgeuse: What’s Up with the Tempestuous Star?

Have you noticed that Orion the Hunter—one of the most iconic and familiar of the wintertime constellations—is looking a little… different as of late? The culprit is its upper shoulder star Alpha Orionis, aka Betelgeuse, which is looking markedly faint, the faintest it has been for the 21^st century.

December 23, 2019December 23, 2019 by Evan Gough

Halo Around a Pulsar could Explain Why We See Antimatter Coming from Space

Astronomers have been watching a nearby pulsar with a strange halo around it. That pulsar might answer a question that’s puzzled astronomers for some time. The pulsar is named Geminga, and it’s one of the nearest pulsars to Earth, about 800 light years away in the constellation Gemini. Not only is it close to Earth, but Geminga is also very bright in gamma rays.

December 23, 2019December 23, 2019 by David Dickinson

Our Guide to the December 26th Annular ‘Ring of Fire’ Eclipse

Mid-eclipse, perfectly centered ring of fire. Image credit and copyright: Kevin Baird.

Ready for the final ‘Ring of Fire’ solar eclipse of 2019? The final eclipse of the year kicks off this week on Wednesday, early on December 26^th the day after Christmas, with an annular solar eclipse spanning the Indian Ocean region from the Middle East to the western Pacific.

December 21, 2019December 21, 2019 by Matt Williams

Black Holes Were Already Feasting Just 1.5 Billion Years After the Big Bang

This illustration depicts a gas halo surrounding a quasar in the early Universe. The quasar, in orange, has two powerful jets and a supermassive black hole at its centre, which is surrounded by a dusty disc. The gas halo of glowing hydrogen gas is represented in blue. A team of astronomers surveyed 31 distant quasars, seeing them as they were more than 12.5 billion years ago, at a time when the Universe was still an infant, only about 870 million years old. They found that 12 quasars were surrounded by enormous gas reservoirs: halos of cool, dense hydrogen gas extending 100 000 light years from the central black holes and with billions of times the mass of the Sun. These gas stashes provide the perfect food source to sustain the growth of supermassive black holes in the early Universe.

Thanks to the vastly improved capabilities of today’s telescopes, astronomers have been probing deeper into the cosmos and further back in time. In so doing, they have been able to address some long-standing mysteries about how the Universe evolved since the Big Bang. One of these mysteries is how supermassive black holes (SMBHs), which play a crucial role in the evolution of galaxies, formed during the early Universe.

Using the ESO’s Very Large Telescope (VLT) in Chile, an international team of astronomers observed galaxies as they appeared about 1.5 billion years after the Big Bang (ca. 12.5 billion years ago). Surprisingly, they observed large reservoirs of cool hydrogen gas that could have provided a sufficient “food source” for SMBHs. These results could explain how SMBHs grew so fast during the period known as the Cosmic Dawn.

December 20, 2019December 20, 2019 by Matt Williams

Astronomers Discovered a New Kind of Explosion That the Sun Can Do

Credit: NASA/SDO/Abhishek Srivastava/IIT(BHU)?

In the course of conducting solar astronomy, scientists have noticed that periodically, the Sun’s tangled magnetic field lines will snap and then realign. This process is known as magnetic reconnection, where the magnetic topology of a body is rearranged and magnetic energy is converted into kinetic energy, thermal energy, and particle acceleration.

However, while observing the Sun, a team of Indian astronomers recently witnessed something unprecedented – a magnetic reconnection that was triggered by a nearby eruption. This observation has confirmed a decade-old theory about magnetic reconnections and external drivers, and could also lead to a revolution in our understanding of space weather and controlled fusion and plasma experiments.

December 20, 2019December 20, 2019 by Evan Gough

Mars 2020 Takes a Test Drive

In a laboratory in Pasadena, California, engineers observed the first driving test for NASA's Mars 2020 rover on Dec. 17, 2019. Credits: NASA/JPL-Caltech

NASA’s Mars 2020 rover has passed its driving test. The test was mostly a forward and backward maneuver, with a six-wheeled pirouette thrown in. It’s autonomous navigation system was also part of the test. Like a toddler’s first tentative steps, this is an important milestone.

December 20, 2019February 17, 2023 by Matt Williams

100,000 Supernovae Exploded Near the Core of the Milky Way

Taken with the HAWK-I instrument on ESO’s Very Large Telescope in the Chilean Atacama Desert, this stunning image shows the Milky Way’s central region with an angular resolution of 0.2 arcseconds. This means the level of detail picked up by HAWK-I is roughly equivalent to seeing a football (soccer ball) in Zurich from Munich, where ESO’s headquarters are located. The image combines observations in three different wavelength bands. The team used the broadband filters J (centred at 1250 nanometres, in blue), H (centred at 1635 nanometres, in green), and Ks (centred at 2150 nanometres, in red), to cover the near infrared region of the electromagnetic spectrum. By observing in this range of wavelengths, HAWK-I can peer through the dust, allowing it to see certain stars in the central region of our galaxy that would otherwise be hidden.

Thanks to the latest generation of sophisticated telescopes, astronomers are learning things a great deal about our Universe. The improved resolution and observational power of these instruments also allow astronomers to address previously unanswered questions. Many of these telescopes can be found in the Atacama Desert in Chile, where atmospheric interference is minimal and the cosmos can be seen with greater clarity.

It is here that the European Southern Observatory (ESO) maintains many observatories, not the least of which is the Paranal Observatory where the Very Large Telescope (VLT) resides. Recently, an international team of astronomers used the VLT to study the center of the Milky Way and observed evidence of ancient starbursts. These indicate that the central region of our galaxy experienced an intense period of star birth in the past.