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Earth’s north star – Polaris – is located nearly directly above Earth’s north pole. There’s a star above Mars’ north pole, too, but it’s very faint.
Iridescent clouds – clouds with rainbow colors – happen when especially tiny water droplets or small ice crystals individually scatter light.
A ring or circle of light around the sun or moon is called a halo by scientists.
You’ve no doubt heard star names such as Polaris or Betelgeuse. But what about our star? Does the sun have a name, and if so what is it?
Read about star travel via conventional propulsion, warp drives, and more.
Red rainbows happen when the sun is on the horizon. They’re created in much the same process that causes a sunset or sunrise to look red.
As Earth spins under the sky, the stars appear to move. When a camera captures that movement, that’s called a star trail. Plus … an astrophotographer explains how he does it.
A rainbow isn’t a flat two-dimensional image on the dome of sky. It’s more like a mosaic, composed of many separate bits … in three dimensions.
That glow over the unlit part of a crescent moon – called earthshine – is light reflected from Earth.
Sun pillars, or light pillars, are shafts of light extending from the sun or other bright light source. They’re caused by ice crystals drifting in Earth’s air.
What are the Ides of March? We in modern times probably wouldn’t know, if it weren’t for William Shakespeare.
A star’s luminosity is its true brightness. Nearly every star you see with the unaided eye is more luminous than our sun.
It’s sometimes said that, on a worldwide scale, solar eclipses outnumber lunar eclipses by about a three to two margin. True?
This year, in 2016, there are 12 full moons and 13 new moons, but only four eclipses – two solar and two lunar.
People used to think that strong winds – which can reach 90 mph in the Death Valley desert – caused the rocks to move. In fact, that’s not what happens.
… And why does it move forward?
First time we can see 5 planets at once since 2005. All 5 are up before dawn, still, and all 5 will remain visible until Mercury disappears in the dawn just after mid-February.
Depending on the temperature and humidity of the air where the snowflakes form, the resulting ice crystals will grow into a myriad of different shapes.
And how many potential supernovae are located within the unsafe distance?
Age of Aquarius begins when vernal equinox point moves out of constellation Pisces and into Aquarius. There’s no definitive answer as to when that will be.
Earth’s shadow, sea and land
Moon and Aldebaran before dawn July 29