Astronomy Staff, Author at Astronomy.com | Page 12 of 278

The Moon with South Pole–Aitken Basin circled

What would happen to Earth if a large asteroid hit the Moon?

Images of SMBHs in M87 and the Milky Way

What are the blobs in the EHT image of the Milky Way’s supermassive black hole?

How do professional observatories deal with dew on mirrors and lenses?

Solar System, Stars

Why is Jupiter not a star or a brown dwarf?

Phobos as seen from Mars

Ask Astro: Can Phobos and Deimos be seen from the surface of Mars?

Millisecond pulsar

Ask Astro: How do some astrophysical objects spin hundreds of times per second?

Diffraction spike patterns

Astrophotography, Observing

Ask Astro: What causes the pattern of diffraction spikes in astronomical images?

Defining planetary poles

Ask Astro: How do we distinguish the north and south poles of planets other than Earth?

Cassiopeia A supernova remnant

Ask Astro: Do all supernovae produce the same elements?

The Sun in Hydrogen-alpha

Astrophotography, The Sun

Ask Astro: Why aren’t solar eclipse photos taken using a Hydrogen-alpha filter?

Astronomy Editor David J. Eicher to speak at ALCon 2023

The transit method

Ask Astro: How many exoplanets does the transit method miss?