In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small ...

"Our finding offers key constraints for models of massive galaxy formation and the origin of spiral structures in the early universe." In the Universe around us today, galaxies come in a number of ...

We typically think of the Oort cloud as scattered ice balls floating far from the sun, yet still tied to it gravitationally.

Wherever we look in the Universe we see spiral galaxies. 70% of all galaxies today have this spiral structure that show up in their stars and their gas that’s used to make more s ...

"Without Andromeda as a proxy for spiral galaxies in the universe at large, astronomers would know much less about the structure and evolution of our own Milky Way," the ESA representatives wrote.

Spiral galaxies have a thin ... so too have we found that our galaxy holds no special place in the universe. Galaxies observed in the Hubble Deep Field image The image above is from the Hubble ...

This one appears to us now as it looked when the universe was about five billion years old. The sun formed within a cloud of gas in a spiral arm of the Milky Way galaxy. A vast disk of gas and ...

The expansion of the Universe is not constant ... 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 ...