Space telescope spots unexpected starquakes

An artist's impression of ESA's Gaia satellite observing the Milky Way. The background image of the sky is compiled from data from more than 1.8 billion stars.

(CNN)Strange and unexpected tsunami-like starquakes -- movements on stars' crusts similar to earthquakes we experience on our planet -- have been revealed by the European Space Agency's Gaia space observatory.

The unusual starquakes are among multiple new discoveries made by Gaia, a mission launched in 2013 to create the "most accurate and complete multi-dimensional map of the Milky Way." On Monday, ESA released its third batch of data from the spacecraft, revealing fresh details on nearly 2 billion stars in our galaxy.
"Starquakes teach us a lot about stars, notably their internal workings. Gaia is opening a goldmine for 'asteroseismology' of massive stars," said Conny Aerts, a professor at the Institute of Astronomy at KU Leuven in Belgium and a member of the Gaia collaboration, a group of 400 researchers that work on the data from the project, in an ESA news release.
    The Gaia spacecraft detected starquakes, movements on stars' crusts similar to earthquakes.
    The agency described the stellar vibrations spotted by Gaia as "large-scale tsunamis" that changed the shape of stars. Gaia wasn't originally designed to detect the phenomenon but was able to discern strong movement on the surface of thousands of stars, including some where starquakes had seldom been seen before.
      Previously, Gaia had detected radial oscillations -- motions diverging from a common point -- that caused some stars to swell and shrink periodically while keeping their spherical shape. The newly discovered oscillations were non-radial.
      Gaia is uniquely positioned about 930,000 miles from Earth in the opposite direction from the sun. The spacecraft carries two telescopes that can scan our galaxy from a location called the Lagrange 2, or L2, point. At this point, the spacecraft is able to remain in a stable spot due to the balance of gravitational forces between Earth and the sun.
      This also means that the spacecraft doesn't have any interference from Earth's light, and it can use the minimum amount of fuel to remain in a fixed position. The vantage point allows Gaia to have unfettered views and continuously scan our galaxy.
        "With this incredible database we can build a comprehensive picture of the Milky Way and delve into its incredible history of formation, seeing direct evidence of both violent past interactions with other galaxies, and internal bouts of intense star formation along (the Milky Way's) spiral arms," said Nicholas Walton, a research fellow at Institute of Astronomy at University of Cambridge and member of the ESA Gaia collaboration, in a statement.
        Much of the latest information about the Milky Way was revealed by Gaia's newly released spectroscopy data, resulting from a technique in which the starlight is split into its constituent colors, like a rainbow.
        The data gathered by Gaia includes new information on the chemical composition, temperatures, mass, and age of stars, as well as the speed at which they move toward or away from Earth. Detailed information about more than 150,000 asteroids in our solar system and space dust -- what lies between stars -- was also released.
        Data from Gaia reveals the speed at which more than 30 million Milky Way stars move toward or away from Earth. Blue shows the parts of the sky where the average motion of stars is toward us and red shows the regions where the average motion is away from us.