Astronomy

Mona Evans

Everybody recognizes Saturn's rings, but that isn't all that circles the planet. There are shepherd moons, a moon with cold volcanoes erupting, a planet-sized moon, and more. And it took nearly two hundred years for the first seven known moons to get named.

Mona Evans

Saturn's moon Titan is bigger than the planet Mercury. It's also the only moon with a thick atmosphere. In fact the atmosphere is so smoggy, we can't see the surface. How is Titan like Earth?

Mona Evans

The winners of the 12th Greenwich Astronomy Photographer of the Year competition were presented online this year. There were two socially distanced presenters. Winners included close-up Andromeda, an ethereal aurora, colorful clouds, and a sad warning of what could be the end of astrophotography.

Mona Evans

Achievements may be honored with prizes and medals, but few get represented as children's toys. However Lego responded to a proposal to showcase women in space and astronomy by making a Lego set representing four such women and their major contributions. Who were these women?

Mona Evans

Everybody knows what weather is - sun, rain, wind, cloud, etc. Although there's no atmosphere in space, space weather can endanger astronauts, and in our technological world, a severe solar storm could affect everybody. So what is space weather?

Mona Evans

Much of the southern sky wasn't visible to the ancient Mediterranean civilizations. Instead of representing the ancient myths, the constellations were invented long afterwards by European explorers and astronomers. Some of Abbe Lacaille's inventions are tributes to the arts.

Mona Evans

Rosetta, the European Space Agency (ESA) spacecraft, traveled for ten years and billions of miles in order to rendezvous with a comet, accompany it as it moved through the inner Solar System past the Sun, and deploy a lander.

Mona Evans

Join me on a Halloween astronomical tour. See a cosmic witch and cosmic ghosts, spiders and snakes, and fiery skull. But have no fear. It's a virtual tour and all these objects are a very long way away.

Mona Evans

Halloween falls midway between an equinox and a solstice. In the ancient Celtic world it was the new year's eve and start of winter - time to prepare for survival in the darkening days. But also a time when the boundary between our world and the otherworld weakened. Who knew what might cross it?