Estimate: 156 Billion Ly
A picture paints a thousand words, so just look at this poster and try to imagine/comprehend how big our universe is. The mind boggling figures are written below. Here is a link to the full sized image.
Earth 1.27×104 km
Solar System 2.99×1010 km or 0.0032 Ly
Solar interstellar 6.17×1014 km or 65 Ly
Milky Way 1.51×1018 km or 160,000 Ly
Local Galactic Group 3.1×1019 km or 6.5 million Ly
Local Super Cluster 1.2×1021 km or 130 Million Ly
Universe 1.5×1024 km or 156 Billion Ly (but no one really knows for sure)
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