Astronomy Archives

February 16, 2020February 16, 2020 by Fraser Cain

Betelgeuse Is Still Dimming! And We Have the Pictures to Prove It

Betelgeuse before and after dimming — This comparison image shows the star Betelgeuse before and after its unprecedented dimming. The observations, taken with the SPHERE instrument on ESO’s Very Large Telescope in January and December 2019, show how much the star has faded and how its apparent shape has changed.

Near the end of 2019, astronomers watching the red giant Betelgeuse noted how much the star had dimmed, continuing to steadily fade for months.

It’s a variable star, and it’s known to get dimmer and brighter, but the big surprise is that it’s still continuing to dim, recently passing magnitude 1.56 and still getting dimmer. This is unprecedented in the decades that astronomers have been watching the star.

February 13, 2020February 13, 2020 by Evan Gough

Beautiful Exposed Bedrock and Sand Dunes on Mars

An impact crater south of Aurorae Chaos on Mars. Large enough craters form central uplifts or peaks of exposed bedrock. Image Credit: NASA/JPL/UArizona

Impact craters can be quite complex. Depending on the size of the impactor, and on the size of the planet it strikes, craters form differently. Some form central peaks or uplifted structures, or even pits as seen in this image.

February 13, 2020February 13, 2020 by Evan Gough

Mars Was Hit By a Lot of Protoplanets Early in its History, Taking Longer to Form than Previously Thought.

Scientists developed this illustration of how early Mars may have looked, showing signs of liquid water, large-scale volcanic activity and heavy bombardment from planetary projectiles. SwRI is modeling how these impacts may have affected early Mars to help answer questions about the planet’s evolutionary history. Image Credit: SwRI/Marchi

There are around 61,000 meteorites on Earth, or at least that’s how many have been found. Out of those, about 200 of them are very special: they came from Mars. And those 200 meteorites have been important clues to how Mars formed in the early Solar System.

February 13, 2020April 30, 2020 by David Dickinson

Catch Comet T2 PanSTARRS This Spring

Ready for the next great comet? First, the bad news. there is not (as of yet), a good naked eye comet in the cards, for 2020. The good news is… there is a fine binocular comet currently well-placed for northern hemisphere viewers: Comet T2 PanSTARRS.

February 12, 2020February 12, 2020 by Evan Gough

A Rare Fast Radio Burst has been Found that Actually Repeats Every 16 Days

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.

A team of scientists in Canada have found a Fast Radio Burst (FRB) that repeats every 16 days. This is in stark contrast to other FRBs, which are more sporadic. Some of those sporadic FRBs occur in clusters, and repeat irregularly, but FRBs with a regular, repeatable occurrence are rare.

February 12, 2020February 12, 2020 by Evan Gough

Here are the First Pictures from CHEOPS

First image of the star chosen as target for CHEOPS after cover opening. The star, at the centre of the image, is located at a distance of 150 light-years from us, in the constellation of Cancer. Image Credit:ESA/Airbus/CHEOPS Mission Consortium

The CHEOPS spacecraft is taking the first tentative steps in its mission. Back on January 29th, the spacecraft opened the cover on its lens. Now, we have the first images from CHEOPS.

February 11, 2020February 18, 2020 by Evan Gough

Astronomers Have Some Serious Concerns About Starlink and Other Satellite Constellations

till image from Hadley's simulation of the Starlink satellite constellation. Credit: Mark Hadley

Picture the space around Earth filled with tens of thousands of communications satellites. That scenario is slowly coming into being, and it has astronomers concerned. Now a group of astronomers have written a paper outlining their detailed concerns, and how all of these satellites could have a severe, negative impact on ground-based astronomy.

February 11, 2020February 11, 2020 by Matt Williams

SpaceX is Thinking of Spinning Off Starlink and Taking it Public

In May of 2019, SpaceX launched the first batch of satellites that will make up its Starlink constellation, thus delivering on Musk’s promise to provide broadband internet access to the whole world. Since then, the company has conducted several launches of upgraded satellites with the intent of creating a constellation of 1,584 by 2024 and 2,200 by 2027.

According to the latest statements made by Gwynne Shotwell, SpaceX’s President and Chief Operations Officer (COO), the company is considering spinning off Starlink and making it a publicly-traded company in the coming years. The announcement was made on Thursday, Feb. 6th, at a private investor event hosted by JPMorgan Chase & Co. in Miami.

February 10, 2020February 10, 2020 by Matt Williams

The ESA’s Solar Orbiter, a Mission That Will Chart the Unexplored Polar Regions of the Sun, Just Launched!

Artist's impression of ESA's Solar Orbiter spacecraft. Credit: ESA/ATG medialab

In the coming years, a number of will be sent to space for the purpose of answering some of the enduring questions about the cosmos. One of the most pressing is the effect that solar activity and “space weather” events have on planet Earth. By being able to better-predict these, scientists will be able to create better early-warning systems that could prevent damage to Earth’s electrical infrastructure.

This is the purpose of the Solar Orbiter (SolO), an ESA-led mission with strong participation by NASA that launched this morning (Monday, Feb. 10th) from Cape Canaveral, Florida. This is the first “medium-class” mission implemented as part of the ESA’s Cosmic Vision 2015-25 program and will spend the next five years investigating the Sun’s uncharted polar regions to learn more about how the Sun works.

February 6, 2020February 6, 2020 by Evan Gough

A Meteor Smashed Into Mars in 2005, Making this Crater

A meteorite struck Mars sometime between February and July 2005 and formed this crater. It's the HiRise Picture of the Day for February 5, 2020. Image Credit: NASA/JPL/UoArizona.

NASA has repeatedly imaged the Martian surface, and sometimes a feature appears that wasn’t there in prior images. That’s what happened when a meteorite survived the plunge through Mars’ thin atmosphere sometime between February and July, 2005. It created this impact crater north of Valles Marineris.