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For the small outer irregular moons of Uranus, such as Sycorax, which were not discovered by the Voyager 2 flyby, even different NASA web pages, such as the National Space Science Data Center [6] and JPL Solar System Dynamics, [5] give somewhat contradictory size and albedo estimates depending on which research paper is being cited.
A size comparison of the six largest galaxies of the Local Group, including the Milky Way. The Milky Way is one of the two largest galaxies in the Local Group (the other being the Andromeda Galaxy), although the size for its galactic disc and how much it defines the isophotal diameter is not well understood. [11]
Gaia is a space observatory of the European Space Agency (ESA), launched in 2013 and operated until March 2025 (planned). The spacecraft is designed for astrometry: measuring the positions, distances and motions of stars with unprecedented precision, [6] [7] and the positions of exoplanets by measuring attributes about the stars they orbit such as their apparent magnitude and color. [8]
In 2018, the Gaia project of the European Space Agency, designed primarily to investigate the origin, evolution and structure of the Milky Way, delivered the largest and most precise census of positions, velocities and other stellar properties of more than a billion stars, which showed that Sgr dSph had caused perturbations in a set of stars ...
The star and related planetary system are located 105 light years away, in the constellation Coma Berenices. Masses of all six of the planets in the system range from 3.9 M ⊕ (mass of Earth) to 8.5 M ⊕. All of the planetary orbits in the HD 110067 system are closer to their star than distance between the planet Mercury and the Sun. [3] [4]
The sizes are listed in units of Jupiter radii (R J, 71 492 km).This list is designed to include all planets that are larger than 1.6 times the size of Jupiter.Some well-known planets that are smaller than 1.6 R J (17.93 R 🜨 or 114 387.2 km) have been included for the sake of comparison.
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 [8] [b] Reported for reference: Theoretical limit of star size (Milky Way) ≳1,700 [9] L/T eff: Estimated by measuring the fraction of red supergiants at higher luminosities in a large sample of supernova ...
Artists' impression of Giotto, the European Space Agency's first interplanetary mission, launched in July 1985. ARD, launched October 1998 – Demonstration mission to test new technologies in atmospheric entry design. CoRoT, launched December 2006 – CNES-led space telescope mission to search for rocky exoplanets and perform asteroseismology ...