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Comparison of the night sky with the night sky of a hypothetical planet within the Milky Way 10 billion years ago, at an age of about 3.6 billion years and 5 billion years before the Sun formed. [261] Globular clusters are among the oldest objects in the Milky Way, which thus set a lower limit on the age of the Milky Way.
The largest of these may have a hydrostatic-equilibrium shape, but most are irregular. Most of the trans-Neptunian objects (TNOs) listed with a radius smaller than 200 km have " assumed sizes based on a generic albedo of 0.09" since they are too far away to directly measure their sizes with existing instruments.
Located at a distance of 17,090 light-years (5,240 parsecs), it is the largest known globular cluster in the Milky Way at a diameter of roughly 150 light-years. [10] It is estimated to contain approximately 10 million stars, with a total mass of 4 million solar masses, [11] making it the most massive known globular cluster in the Milky Way.
Astronomers have discovered a black hole with a mass about 33 times greater than that of our sun, the biggest one known in the Milky Way aside from the supermassive black hole lurking at the ...
Longest transit orbital period of any confirmed transiting exoplanet discovered at the duration of 1107 days [224] and largest circumbinary planet discovered. [225] This planet is located within the habitable zone of binary star system Kepler-1647 and thus could theoretically have a habitable Earth-like exomoon. [226] Kepler-90h: 1.01 ± 0.09 ...
Wasp 17b -- The biggest planet discovered by humans is an exoplanet some 1,000 light-years away that can be found in the constellation of Scorpius. It's more than 173,000 miles in diameter.
List of the largest known stars in the Milky Way Star name Solar radius (R ☉) Method [a] Notes Orbit of Saturn: 2,047 – 2,049.9 [10] [b] Reported for reference: Theoretical limit of star size (Milky Way) ≳1,700 [11] L/T eff: Estimated by measuring the fraction of red supergiants at higher luminosities in a large sample of supernova ...
Planet c is possibly a potentially habitable Super-Earth but is probably too hot or massive. [55] [56] Mu Arae: Ara: 17 h 44 m 08.70 s: −51° 50′ 02.6″ 5.15: 51: G3IV-V: 1.077: 5704: 6.413: 4: Planet Quijote orbits in the circumstellar habitable zone. However, it is a gas giant, so it itself is uninhabitable although a large moon orbiting ...