Terrestrial planet Terrestrial planet A terrestrial planet, telluric planet, or rocky planet is a planet that is composed primarily of silicate rocks or metals. Within the Solar System, the terrestrial planets are the inner planets closest to the Sun, i.e. Mercury, Venus, Earth, and Mars. The terms "terrestrial planet" and "telluric planet" are derived from Latin words for Earth ("Terra" and "Tellus"), as these planets are, in terms of structure, "Earth-like". Terrestrial planets have a solid planetary surface, making them substantially different from the larger giant planets, which are composed mostly of some combination of hydrogen, helium, and water existing in various
Hackers on Planet Earth workshops, and book signings.<br> The "closing ceremony" is a regular part of the event, celebrating the event, the organizers, and volunteers, but also features performances. Since 2006, monochrom's Johannes Grenzfurthner is a regular performer at the closing ceremony. Hackers on Planet Earth The Hackers on Planet Earth (HOPE) conference series is a hacker convention sponsored by the security hacker magazine "" that is typically held at Hotel Pennsylvania, in Manhattan, New York City. Occurring biennially in the summer, there have been twelve conferences to date with the most recent occurring 20–23 July 2018. HOPE features talks, workshops, demonstrations, tours, and