What are the northern lights?
The northern lights, one of several astronomical phenomena called polar lights (aurora polaris), are shafts or curtains of colored light visible on occasion in the night sky.Aurora borealis – the Northern Lights.…
Article
What does it mean when they say the universe is expanding?
When scientists talk about the expanding universe, they mean that it has been growing ever since its beginning with the Big Bang.Galaxy NGC 1512 in Visible Light External. Photo taken by the…
Article
What is a Black Hole?
When a particularly large star nears the end of its life, it often becomes a black hole.First Image of a Black Hole. The Event Horizon Telescope (EHT) — a planet-scale array of…
Article
What is a blue moon? Is the moon ever really blue?
“Once in a blue moon” is a common expression that has been used for a long time, and which means ‘not very often,’ or ‘very rarely.’ It often refers to an extra…
Article
Why is Pluto no longer a planet?
The International Astronomical Union (IAU) downgraded the status of Pluto to that of a dwarf planet because it did not meet the three criteria the IAU uses to define a full-sized planet.…
ArticleWhat are the northern lights? The northern lights, one of several astronomical phenomena called polar lights (aurora polaris), are shafts or curtains of colored light visible on occasion in the night sky.Aurora borealis – the Northern Lights.…
ArticleWhat does it mean when they say the universe is expanding? When scientists talk about the expanding universe, they mean that it has been growing ever since its beginning with the Big Bang.Galaxy NGC 1512 in Visible Light External. Photo taken by the…
ArticleWhat is a Black Hole? When a particularly large star nears the end of its life, it often becomes a black hole.First Image of a Black Hole. The Event Horizon Telescope (EHT) — a planet-scale array of…
ArticleWhat is a blue moon? Is the moon ever really blue? “Once in a blue moon” is a common expression that has been used for a long time, and which means ‘not very often,’ or ‘very rarely.’ It often refers to an extra…
ArticleWhy is Pluto no longer a planet? The International Astronomical Union (IAU) downgraded the status of Pluto to that of a dwarf planet because it did not meet the three criteria the IAU uses to define a full-sized planet.…