What Are Neptunian Planets? - Science@NASA Neptunian planets typically have hydrogen- and helium-dominated atmospheres We’re also discovering mini-Neptunes, planets smaller than Neptune and bigger than Earth
Neptune - Science@NASA Neptune is the eighth and most distant planet from the Sun It’s the fourth largest, and the first planet discovered with math
Neptune: Facts - NASA Science And Neptune makes a complete orbit around the Sun (a year in Neptunian time) in about 165 Earth years (60,190 Earth days) Sometimes Neptune is even farther from the Sun than dwarf planet Pluto
Overview - NASA Science Neptunian planets are similar in size to Neptune or Uranus in our solar system They likely have a mixture of interior compositions, but all will have hydrogen and helium-dominated outer atmospheres and rocky cores
Trans-Neptunian Object - NASA Science This is an artist's concept of a craggy piece of solar system debris that belongs to a class of bodies called trans-Neptunian objects (TNOs) Most TNOs are small and faint, making them difficult to spot
Kuiper Belt: Facts - NASA Science While there are many icy bodies in this region that we broadly refer to as Kuiper Belt Objects (KBOs) or trans-Neptunian objects (TNOs), they're fairly diverse in size, shape, and color
Beyond Point Masses. IV. Trans-Neptunian Object Altjira Is Likely a . . . Dynamically studying trans-Neptunian object (TNO ) binaries allows us to measure masses and orbits Most of the known objects appear to have only two components, except (47171 Lempo, which is the single ) known hierarchical triple system with three similar-mass components
Neptune Moons - NASA Science Neptune has 16 known moons The first moon found – Triton – was spotted on Oct 10, 1846, just 17 days after Neptune was discovered
Hubble Finds New Neptune Moon - NASA Science The body is estimated to be no more than 12 miles across, making it the smallest known moon in the Neptunian system It's so small that it escaped detection by NASA's Voyager 2 spacecraft, which flew by Neptune in 1989 and surveyed the planet's system of moons and rings