NGC 73

NGC 73

NGC 73 is a spiral galaxy in the constellation Cetus about 360 million ly from Earth. It spans roughly 180,000 ly, about 1.8 times the width of our Milky Way. The light reaching us tonight left it about 360 million years ago.

Illustration from its catalogued shape, not a photograph

Spiral
type · SABb
360 million ly
from Earth · from redshift
176k ly
across
14.4
apparent magnitude

Because its light is 360 million ly from home, you are seeing NGC 73 as it looked roughly 360 million years ago. The photons left before that much of history had passed, and are only now reaching us. This distance is estimated from the galaxy's redshift, so the lookback time is approximate.

Nearest galaxies
NGC 102Lenticular19 million ly
apart
IC 20Lenticular21 million ly
apart
NGC 7821Spiral25 million ly
apart
NGC 135Elliptical27 million ly
apart
NGC 154Elliptical32 million ly
apart
NGC 7807Barred spiral35 million ly
apart
Worlds in the same direction on the sky

Source: structural data (position, morphology, brightness, redshift) from OpenNGC (CC BY-SA). Recession velocity from RC3 (de Vaucouleurs et al. 1991, via NASA/HEASARC, public domain). Distance computed by gravityfinder from redshift via Hubble's law (H0 = 70 km/s/Mpc).

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