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EarthSky

Hunter’s Moon photos: Best of 2021

As autumn advances in the Northern Hemisphere, the Hunter's Moon illuminates the world for several nights around October 20. Hunter's Moon photos here.

How high up are meteors when they begin to glow?

How high up are meteors when they begin to glow? Meteors begin to glow almost as soon as they hit Earth's atmosphere,.

Which bird migrates the farthest?

Which bird migrates the farthest? Over its lifetime of about 25 years, an Arctic tern can fly nearly 3 times the distance from the Earth to the moon.

October birthstone: opal or tourmaline

Take your pick: the October birthstone is either the striking iridescent opal or the many-colored tourmaline. Learn the lore of these gemstones here.

How many stars can you see?

Have you ever wondered how many stars are visible on a given night? It all depends on how dark your sky is, what your age is, and other limiting factors.

Cassiopeia the Queen ascends in September and October

Cassiopeia the Queen is an easy-to-find constellation. It has the shape of a W or M. Look in the north-northeast sky on September and October evenings.

Here are the 2022 Breakthrough Prize winners

2022 Breakthrough Prize winners made discoveries leading to Covid-19 vaccines, treatments for neurological diseases, and more precise quantum clocks.

September birthstone is the sapphire

Sapphire, the September birthstone, is typically blue, the color caused by small amounts of titanium and iron in the crystal structure.

Was Comet ATLAS a blast from the past?

Comet ATLAS was seen to break apart in 2020, while still relatively far from the sun. An astronomer thinks our early ancestors saw this comet.

Pluto became a dwarf planet on today’s date

Pluto is the largest of many small bodies in the outer solar system. That's partly why it was demoted from major planet to dwarf planet in 2006.