Scientists are keen to get to the bottom of the dark matter puzzle because this phenomenon accounts for the vast majority of the "stuff" in the universe — about 85%, in fact. That means everything we ...

Our understanding of the three-dimensional properties of the Milky Way has improved dramatically in recent years, largely ...

Our Milky Way is a spiral galaxy rotating around a central point. Our Sun is on one of the spiral arms as shown in the diagram: The Sun's orbital speed is determined almost entirely by the ...

Shapley determined that the Milky Way was 300,000 light years across ... His subsequent tuning-fork diagram of the shapes of galaxies remains a classic teaching tool for astronomers, and even ...

Jamie Carter is an award-winning reporter who covers the night sky. The core of the Milky Way in Sagittarius low in the south over the Frenchman River valley at ... [+] Grasslands National Park ...