The First Total Solar Eclipse in Two Years Is Coming in July

Justin Sullivan/Getty Images
Justin Sullivan/Getty Images

If you saved your protective glasses from 2017's solar eclipse, now's the time to dig them out of storage. A total solar eclipse, the first one visible from Earth in nearly two years, will occur over parts of South America and the South Pacific on July 2, 2019.

What is a solar eclipse?

There are several different types of eclipses, including lunar (when the Moon passes beneath our planet's shadow) and annular (when the Sun's edges are visible as a ring around the Moon). A total eclipse is the best-known and most anticipated of such phenomena: When the Moon is in the right position in the sky, it perfectly aligns with the Earth and the Sun, appearing to totally block out the Sun from certain vantage points. While partial solar eclipses, in which the Moon only covers part of the Sun, can happen a few times a year, total solar eclipses are much rarer.

Where to Watch the Total Solar Eclipse of 2019

Unlike the last total solar eclipse in 2017, this next one doesn't fall over the United States. Most of it will be obscured above the Pacific Ocean, but a small section of the path of totality will be visible from South America. On Tuesday, July 2 around sunset, people in parts of Chile and Argentina can look to the horizon and see the Moon cross the Sun. The event may be worth the trip for eclipse chasers: the Andean region where the eclipse will take place is known for its low humidity and clear skies at high altitudes.

This particular total eclipse is also notable for its duration. At its peak, totality will last four minutes and 33 seconds—which exceeds the peak totality of the total solar eclipse in 2017. But to see the Moon block the Sun for that long, sky-gazers will need to take a boat into the middle of the South Pacific.

Thursday’s Best Amazon Deals Include Guitar Kits, Memory-Foam Pillows, and Smartwatches

Amazon
Amazon
As a recurring feature, our team combs the web and shares some amazing Amazon deals we’ve turned up. Here’s what caught our eye today, December 3. Mental Floss has affiliate relationships with certain retailers, including Amazon, and may receive a small percentage of any sale. But we only get commission on items you buy and don’t return, so we’re only happy if you’re happy. Good luck deal hunting!

3D Map Shows the Milky Way Galaxy in Unprecedented Detail

ESA
ESA

It's our galactic home, but the Milky Way contains many mysteries scientists are working to unravel. Now, as The Guardian reports, astronomers at the European Space Agency have built a 3D map that provides the most detailed look at our galaxy yet.

The data displayed in the graphic below has been seven years in the making. In 2013, the ESA launched its Gaia observatory from Kourou in French Guiana. Since then, two high-powered telescopes aboard the spacecraft have been sweeping the skies, recording the locations, movements, and changes in brightness of more than a billion stars in the Milky Way and beyond.

Using Gaia's findings, astronomers put together a 3D map that allows scientists to study the galaxy in greater depth than ever before. The data has made it possible to measure the acceleration of the solar system. By comparing the solar system's movement to that of more remote celestial objects, researchers have determined that the solar system is slowly falling toward the center of the galaxy at an acceleration of 7 millimeters per second per year, The Guardian reports. Additionally, the map reveals how matter is distributed throughout the Milky Way. With this information, scientists should be able to get an estimate of the galaxy's mass.

Gaia's observations may also hold clues to the Milky Way's past and future. The data holds remnants of the 10-billion-year-old disc that made up the edge of the star system. By comparing it to the shape of the Milky Way today, astronomers have determined that the disc will continue to expand as new stars are created.

The Gaia observatory was launched with the mission of gathering an updated star census. The previous census was conducted in 1957, and Gaia's new data reaches four times farther and accounts for 100 times more stars.

[h/t The Guardian]