The ExoMars Trace Gas Orbiter has taken a wealth of new photographs of the Martian surface, including one showing the InSight lander, which recently touched down on the Red Planet. The images show the great geological diversity of Mars, as well as dunes and evidence of dust devils on the planet. Researchers hope to utilize these photographs during planning for future robotic missions.Read More New Images of Mars from the ExoMars Orbiter Features Photo of InSight Lander Seen from Space
The mass of the Milky Way Galaxy is a question that has long puzzled astronomers and astrophysicists. Estimates ranged from between 500 billion to three trillion times the mass of our Sun. A new study looked at globular clusters, groupings of a million or so stars surrounding the Milky Way. By measuring the velocity at which they circled our galaxy, as measured by the Hubble Space Telescope and the Gaia Telescope, astronomers determined the Milky Way has a mass around one-and-a-half trillion times as great as our Sun.Read More Hubble and Gaia Team Up to Measure the Mass of the Milky Way
The Mars Express orbiter has taken photos of river valleys on the Red Planet, showing evidence that liquid water once flowed across the Martian landscape. Once thought to be completely dry, Mars is now known to have water ice beneath its surface, up to 100 meters, or 330 feet, in depth. Billions of years ago, Mars lost most of its atmosphere, and water on its surface disappeared. Astronomers are still uncertain what caused this dramatic climatic change on the Red Planet.Read More Water, Water Everywhere — On Mars?
A river of 4,000 stars has been detected just 330 light years from the Sun. This grouping is one billion years old, and has circled the outer edge of the Milky Way Galaxy four times since its formation. Astronomers found the formation using the Gaia space telescope, operated by the European Space Agency.Read More Billion-Year-Old River of Stars Seen Flowing Near the Sun