Terrestrial Solar System planets either have high mean molecular weight atmospheres, as with Venus, Mars, and Earth, or no atmosphere at all, as with Mercury.
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Extrasolar Planets: May 2018
K2-18 is a nearby M2.5 dwarf, located at 34 pc and hosting a transiting planet which was first discovered by the K2 mission and later confirmed with Spitzer Space Telescope observations.
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- 28 May: NASA Advisory Council Human Exploration and Operations Committee Meeting
- 30 May: NASA Advisory Council Meeting
- 6 Jun: International Space Development Conference
- 6 Jun: National Space-Based Positioning, Navigation and Timing Advisory Board Meeting
- 6 Jun: NASA Aerospace Safety Advisory Panel Meeting
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