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Top 10 Astronomy News Stories of 2019 – Sky & Telescope

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Our decide for the most important astronomy information story of the 12 months is the first-ever picture of a black gap “shadow.” What’s yours?

The seeds for this 12 months’s milestones in astronomy information have been planted way back. Greater than a decade of planning preceded astronomers’ first-ever picture of a black gap. Virtually 30 years of engineering went into the New Horizons mission. And the most recent interstellar customer most likely traveled at the least 1,000,000 years earlier than we found it within the photo voltaic system.

Illustration of black hole merger

Two black holes put together to merge on this artist’s illustration.
LIGO / Caltech / MIT / Aurore Simonnet(Sonoma State)

Likewise, work is underway this 12 months for future discoveries. The LIGO and Virgo gravitational-wave detectors have been on-line since April 2019, and candidate gravitational-wave occasions have been pouring in by the handfuls. Anticipate to see a listing of confirmed mergers detected throughout the first half of the observing run round April 2020.

Astronomers are additionally to start with levels of planning their subsequent huge mission to comply with the James Webb House Telescope, which is because of launch in 2021. Four mission concepts are battling for the prize, every of them concentrating on a special a part of the electromagnetic spectrum. The ultimate resolution is now anticipated in early 2021.

Illustration of proposed Titan lander

The Dragonfly lander is illustrated throughout touchdown.
NASA

NASA has additionally introduced two thrilling new missions that may bear fruit with extra persistence: The VIPER rover is about to land on the Moon by late 2022, and the Dragonfly mission  will ship a rover-size drone to discover Saturn’s enshrouded moon Titan in 2034.

Within the meantime, as 2019 attracts to an in depth, we glance again on a few of this 12 months’s greatest astronomy information.

1. Image of a Black Hole’s “Shadow”

black hole shadow M87

Scientists used pc codes and months of research to assemble this picture of the supermassive black gap within the middle of the galaxy M87. The darkish middle marks the place mild plunges previous the occasion horizon, by no means to return; the crescent is from the sunshine and scorching fuel simply exterior.
Occasion Horizon Telescope collaboration

Final April, astronomers unveiled the first image of a black hole’s silhouette, a pitch-black gap as seen in opposition to the recent, radio-emitting fuel it’s accreting. The silhouette is just 40 microarcseconds throughout — roughly the scale of a thumbnail seen from 40,000 miles away. To perform this feat took years of planning and coordination between radio telescopes unfold throughout the globe.

2. New Horizon Flies By Arrokoth

On New Yr’s Day, NASA’s New Horizons flew by probably the most distant object we’ve ever visited within the photo voltaic system, the Kuiper Belt object designated (486958) 2014 MU69 and now recognized formally as Arrokoth.

Color composite of 2014 MU69

New Horizons scientists created the composite shade picture at proper by combining the visible-light and near-infrared map of 2014 MU69 seen at left with a higher-resolution picture from the spacecraft’s LORRI digital camera at middle, This composite emphasizes teh total pink shade of each lobes, in addition to the comparatively vibrant (and less-red) ring of fabric across the object’s “neck”.
NASA / JHU-APL / SwRI

The views have been beautiful and sudden, exhibiting a darkish, reddish snowman that turned out not to be snowman-shaped in any respect. The information that New Horizons continues to be within the strategy of downlinking to Earth are shedding mild on how planets fashioned within the early photo voltaic system.

three. Moon Landings, Mushy and . . . Not So Mushy

Three nations tried to land on our nearest celestial neighbor this 12 months — and many more are to come! China made the primary — and solely profitable — touchdown of the 12 months when its Chang’e 4 lander and rover touched down in January. Each lander and rover are each still exploring the Von Kármán Crater on the farside of the Moon.

Yutu 2 solar array

The Yutu 2 rover displays the Solar on the farside of the Moon.
CLEP / CNSA

Two different touchdown makes an attempt ended much less fortunately. Israel’s Beresheet mission, the primary privately funded mission to the Moon, skilled an issue with its major descent engine earlier than impacting the sting of Mare Serenitatis on April 11th. And India’s Chandrayaan 2 lander and rover, named Vikram and Pragyan, skilled a software program glitch earlier than crashing not removed from their supposed touchdown goal close to the lunar south pole. The Chandrayaan 2 orbiter continues to be operational, although, and continues to map the lunar floor.

Infographic: (Back) to the Moon

Click on for a higher-resolution model of this infographic, which reveals deliberate missions to the Moon as of April 2019.

Four. The Second Interstellar Visitor

When astronomers found ‘Oumuamua final 12 months, we thought it was happenchance that we’d found a customer coming from exterior the photo voltaic system. Lo and behold, we have now discovery #2 just one 12 months later!

Comet 2I/Borisov

This two shade composite picture of Comet 2I/Borisov was captured by the Gemini North telescope on September 10, 2019.
Gemini Observatory / NSF / AURA

Whereas ‘Oumuamua challenged our understanding of the origin of such objects, Comet 2I/Borisov meets our expectations in each means. Borisov’s measurement and composition match what we’ve seen in long-period solar system comets and it even sports activities a comet-like fuzz. Observations of Comet Borisov will proceed via early 2020.

5. Tour of the Asteroids

Japan’s Hayabusa 2 spacecraft made historical past when it touched down — twice! — to gather samples from the asteroid 162173 Ryugu. Now, Hayabusa 2 is headed home, as a consequence of fly by Earth in December 2020, when it’s going to eject its pattern return capsule for assortment within the Australian desert.

Ryugu close-up

Ryugu
JAXA / College of Tokyo and collaborators

In the meantime, NASA’s Osiris-REX mission continues to be orbiting 101955 Bennu, poring over the unexpectedly rough terrain that challenged its selections for pattern website choice. In December, NASA introduced that it had chosen the Nightingale site for its “touch-and-go” sample-collecting maneuver, anticipated in mid-2020.

6. Touching the Sun

Simply this month got here the first results from the Parker Solar Probe mission, which has accomplished three of 24 deliberate orbits that take it more and more near the Solar. Parker has already skimmed the Solar’s outermost ambiance, passing inside 24 million kilometers (15 million miles) of the seen floor, or simply over half of Mercury’s distance at perihelion.

solar switchbacks

An outline of ‘switchback’ occasions on the photo voltaic wind.
NASA / Conceptual Picture Lab / Adriana Manrique Gutierrez

Amongst different first findings, scientists introduced the invention of “rogue waves” within the photo voltaic wind, which speed up particles by greater than 300,000 mph in a matter of seconds. Reversals within the magnetic discipline accompany these adjustments, so-called switchbacks that astronomers suppose could maintain the important thing to heating the Solar’s outer ambiance.

7. Starlink vs. the Stars

Maybe probably the most controversial improvement this 12 months have been the a number of launches of Starlink satellites by the aerospace firm SpaceX. Whereas the satellites promise international broadband web (for a value), a lofty sufficient objective, the brightness of the first batch launched in May set off an issue that’s nonetheless ongoing.

Starlinks cross DECam image

Early morning on Monday, November 18th, Cliff Johnson (Northwestern College) and colleagues took this picture utilizing the Darkish Vitality Digicam on the Four-meter Blanco Telescope on the Cerro Tololo Inter-American Observatory. Nineteen Starlink satellite tv for pc trails crossed the picture throughout the six-minute publicity. The picture was taken as a part of the DELVE survey, which is mapping the outskirts of the Magellanic Clouds, in addition to a lot of the southern sky seeking new dwarf galaxies orbiting the Clouds or the Milky Approach.
DELVE Survey / CTIO / AURA / NSF

The satellite tv for pc prepare — which seems when the Starlink satellites are nonetheless in low orbits and clumped collectively on the sky — is a sight to behold. However even when the satellites have ascended, they’re nonetheless vibrant. And with round 12,000 accredited for launch by the Federal Communications Fee, they’re additionally shockingly quite a few. This 12 months alone has seen the launch of 120 satellites, with one other launch slated for the tip of December.

eight. Oppie’s Goodbye

A 2018 mud storm lined the photo voltaic panels of the Alternative rover on Mars, however for months NASA engineers labored to recuperate the rover. To no avail — NASA formally introduced the tip of the Alternative mission in February.

Oppy's path

Alternative’s historic trek to Endeavour crater.
NASA / JPL-Caltech / MSSS / NMMNHS

Designed to final 90 days, the intrepid mission as a substitute went for nearly 15 years, lined some 45.16 kilometers (28.06 miles), and adjusted our understanding of the Purple Planet’s moist and heat previous.

9. Nobel Prize Goes to Astronomy

It isn’t yearly that astronomers obtain the Nobel Prize in Physics — the final time was in 2017 and earlier than that 2011. This 12 months, the prize went to James Peebles and to Michel Mayor and Didier Queloz for disparate discoveries that nonetheless supply new views on our place within the universe: Peebles was honored for his theoretical work in cosmology, whereas Mayor and Queloz obtained the award for his or her observations of a planet round a Solar-like star.

10. Jupiter’s Unfurling Great Red Spot

Maybe the most important occasion to hit yard telescopes this 12 months was the unfurling of Jupiter’s Nice Purple Spot (GRS). Brilliant pink, methane-free flakes emerged from the west finish, after which the east finish of the GRS because the Southern Equatorial Belt seems to be pulling materials from the nice storm, making a churning bridge between the 2 options.

Jupiter captured by Clyde Foster in Centurion, South Africa on Might 20th with a 14-inch telescope and ZWO ASI290MM digital camera.

Such flaking occasions aren’t exceptional, however they used to occur solely not often; over the previous few years, they appear to be occurring regularly. It’s nonetheless unclear how these occasions are associated to the diminishing size of the Great Red Spot, if in any respect.

Honorable point out: Gaia’s New View

In 2018, the European House Company’s Gaia mission launched its newest catalog, charting distances to greater than a billion Milky Approach stars. Now, that knowledge is paying off in droves. Astronomers how have a new, more precise estimate of the Milky Way’s mass: equal to 1.5 trillion Suns. Additionally they have a new timeline for our meet-up with our sister galaxy Andromeda, delayed from three.9 billion years from now to Four.5 billion years. (Additionally, it seems it’ll be extra of a glancing blow than a head-on collision.)

Rotation of Andromeda Galaxy

On this view of the Andromeda Galaxy from NASA’s GALEX satellite tv for pc, yellow arrows point out the typical stellar motions at varied areas primarily based on knowledge from Gaia’s second knowledge launch.
Star motions: ESA / Gaia; Background picture: NASA / Galex; R. van der Marel / M. Fardal / J. Sahlmann (STScI)

A number of research are additionally utilizing Gaia to peek into our galaxy’s past, and even probe its dark matter surroundings. Individually, these research could appear small, however collectively they’re remodeling our understanding of the galaxy we name house.




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