Astrophysics | Page 2 of 46 | Astronomy.com

three spectra

How does spectroscopy work?

V838 Monocerotis

What is a light echo?

10 modern mysteries of the universe

LHC at CERN

Is there a hottest temperature possible in the universe?

Painted in 1690 by Thomas Murray, this portrait features young Edmond Halley holding a paper with a diagram of an elliptical orbit.

Science, Solar System

Edmond Halley: The man behind the comet

Objects like Arrokoth could preserve ‘primitive ices’ from the birth of our solar system

There isn’t a scale large enough to weigh galaxies like NGC 7714. ESA, NASA; Acknowledgement: A. Gal-Yam (Weizmann Institute of Science)

Ask Astro: How do scientists weigh planets and other celestial objects?

Exotic Objects, Milky Way

How do you find a black hole? An astronomer explains the thrilling hunt

Could a telescope see the beginning of time? An astronomer explains

OSIRIS-REx’s TAGSAM sample collector

Top 10 space stories of 2023

Cosmology, Science

Will we ever figure out how to defy gravity?

Alpha Centauri (the yellow star just to the right of center) is the closest bright star to Earth. At 4.35 light-years away, on a scale model where Earth is the size of a bacterium, this star would sit 4.34 miles (nearly 7 km) distant.

Strange Universe: Empty conclusions