It has long been a sport for skywatchers to spot the youngest possible crescent moon after sunset, with the eye alone. What does it take to see a very young moon? Details here.
Can you hear a meteor as it streaks overhead? Some people have reported hearing meteors with a sizzling sound like bacon frying. Scientists now say you can, and explain how it happens.
Happy birthday June babies! Your month has 3 birthstones – pearl, moonstone, and alexandrite.
Happy birthday, January babies! Your birthstone is the garnet.
The Brocken Spectre is your own shadow, cast on mists below you, when you are mountain climbing. The shadow may appear enormous and has a ring around it.
Happy birthday to all you March babies. Your month has 2 birthstones – the aquamarine and the bloodstone.
The major planets in our solar system orbit, more or less, in a single plane. That’s why you can look for them along the same sky path traveled by the sun and moon. Is the same true for exoplanets in distant solar systems?
A large ring or circle of light around the sun or moon is called a 22-degree halo by scientists.
One side of the moon always faces Earth. Even so, over time, it’s possible to see as much as 59% of the moon’s surface, due to lunar libration.
Some extremely large and hot stars blaze away with the luminosity of a million suns! But other stars look bright only because they’re near Earth.
From Earth’s North and South Poles, all the stars appear as circumpolar. Meanwhile, at the equator, no star is circumpolar. And what about in between?
How big can stars get? And how do these monster stars get so big?
Uranus lies nearly sideways with respect to the plane of its orbit around the sun. That sideways tilt makes a huge difference between winter-summer on Uranus, and autumn-spring.
Lucky New Year’s foods in the U.S. South and around the world. Happy 2017!
One journey of our sun and planets around the center of our Milky Way galaxy is sometimes called a cosmic year. That’s approximately 225-250 million Earth-years.
It’s sometimes said that, on a worldwide scale, solar eclipses outnumber lunar eclipses by about a three to two margin. True?
… 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.
New Year’s Day is a civil event. Its date isn’t precisely fixed by any natural seasonal marker.
Jupiter’s gravity slings long-period comets out of harm’s way, while nudging some asteroids closer to Earth. And, in 1770, Jupiter took aim on Earth – but missed.
The Mars-Uranus conjunction of January 2021
Identify stars in the Winter Circle