Choose a background or upload your own photo, then download a shareable quote image.
Your file stays in the browser; nothing is sent to the server.
Choose a background or upload your own photo, then download a shareable quote image.
We knew from theoretical models that mergers of massive, gas-rich galaxies were more frequent in the past. Now we've found that these mergers are responsible for producing both the nearby obscured quasar population and their distant cousins.