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The light-travel distance to the edge of the observable universe is the age of the universe times the speed of light, 13.8 billion light years. This is the distance that a photon emitted shortly after the Big Bang, such as one from the cosmic microwave background , has traveled to reach observers on Earth.
The Andromeda Galaxy is approximately 2.5 million light-years away. 3 × 10 6 ly: The Triangulum Galaxy , at about 3 million light-years away, is the most distant object visible to the naked eye. 5.9 × 10 7 ly: The nearest large galaxy cluster, the Virgo Cluster, is about 59 million light-years away. 1.5 × 10 8 – 2.5 × 10 8 ly
The red line is the path of a light beam emitted by the quasar about 13 billion years ago and reaching Earth at the present day. The orange line shows the present-day distance between the quasar and Earth, about 28 billion light-years, which is a larger distance than the age of the universe multiplied by the speed of light, ct.
The paper states that "14 of the 31 GRBs are concentrated within 45 degrees of the sky", [3] which translates to the size of about 10 billion light-years (3 gigaparsecs) in its longest dimension, [original research?] which is approximately one ninth (10.7%) of the diameter of the observable universe. However, the clustering contains 19 to 22 ...
Structures larger than this size are incompatible with the cosmological principle according to all estimates. However, whether the existence of these structures itself constitutes a refutation of the cosmological principle is still unclear. [20] Ho'oleilana Bubble (2023) 1,000,000,000 Contains about 56,000 galaxies, located 820 million light ...
Below are lists of the largest stars currently known, ordered by radius and separated into categories by galaxy. The unit of measurement used is the radius of the Sun (approximately 695,700 km; 432,300 mi).
A mysterious light has been blinking in space every 21 minutes for 35 years–and scientists have no idea what it is. What could it be?
A size comparison of the six largest ... roughly 40,000 light years (13 ... halo with measured ages very close to the 13.80-billion-year age of the Universe.