Related topics: nasa · stars · planets · moon · solar system

Astronomers, billboard companies clash over signs that shine

Arizona has long been a haven for astronomers who take advantage of its mountain peaks and vast stretches of dark, desert sky to gaze at stars and planets. The state is also home to a thriving billboard industry whose signs ...

What is time – and why does it move forward?

Imagine time running backwards. People would grow younger instead of older and, after a long life of gradual rejuvenation – unlearning everything they know – they would end as a twinkle in their parents' eyes. That's ...

Messier 3 (M3) – the NGC 5272 globular cluster

During the late 18th century, Charles Messier began to notice a series of "nebulous" objects in the night sky which he originally mistook for comets. With the hope of preventing other astronomers from making the same mistake, ...

What to look for when buying a telescope

I'm often asked what inspired me to become an astronomer, and I explain that a pivotal moment for me was stargazing through my grandfather's telescope.

New project puts open data back into the hands of citizens

As streetlights the world over change from sodium lamps to LED, scientists wonder what this will mean for the artificial skyglow over cities. Because not every city lights the same way, the best way to understand whether ...

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