Tagged “Constellations”

4 articles

Dark stars may have left gravitational wave echoes across the universe.

Pulsar timing arrays (PTAs) recently detected an ultra-low-frequency gravitational-wave background permeating the universe. A 2026 study suggests this signal may originate not only from merging supermassive black hole binaries, but could also contain signatures of giant "dark stars" that existed over 13 billion years ago. If confirmed, these gravitational waves could help reveal the origins of the universe's earliest supermassive black holes.

2 min read4

Observing the Sky

Why astrology is not a science

Not because it is old, nor because Earth's axis has shifted. The decisive reason is elsewhere: whenever it is tested double-blind, astrology performs no better than chance.

3 min read4

Stars and Galaxies

The 20 brightest stars in the night sky

Ranked by apparent magnitude — brightness as seen from Earth, not true luminosity. Sirius leads because it is close; Deneb makes the list from hundreds of times farther away.

3 min read2

Observing the Sky

The constellations of the zodiac

The ecliptic is the Sun's yearly path across the celestial sphere. Under the modern definition of constellation boundaries it crosses thirteen of them, not twelve.

2 min read3