Planets similar to or like Venus
Second planet from the Sun. Wikipedia
Unconfirmed (and frequently disputed) exoplanet claimed to orbit within the Gliese 581 system, twenty light-years from Earth. Discovered by the Lick–Carnegie Exoplanet Survey, and is the sixth planet orbiting the star; however, its existence could not be confirmed by the European Southern Observatory / High Accuracy Radial Velocity Planet Searcher (HARPS) survey team, and its existence remains controversial. Wikipedia
Extrasolar planet located approximately 16 light-years (4.93 parsecs, or about 151,400,000,000,000 km) away in the constellation of Grus, orbiting the star Gliese 832, a red dwarf. In its star's habitable zone and a big reason for its high rating is it receives the same amount of solar flux as the earth in the habitable exoplanets catalog. Wikipedia
Hypothetical planet in the outer region of the Solar System. Its gravitational effects could explain the unusual clustering of orbits for a group of extreme trans-Neptunian objects (eTNOs), bodies beyond Neptune that orbit the Sun at distances averaging more than 250 times that of the Earth. Wikipedia
- It is calculated that the Sun will become sufficiently large to engulf the current orbits of Mercury and Venus, and render Earth uninhabitable – but not for about five billion years.
- Earth is unusual among the planets of the Solar System in having such a high concentration of oxygen gas in its atmosphere: Mars (with 0.1% by volume) and Venus have much less.
- Early in their geologic histories, Mars and Venus are theorized to have had large water oceans.
- The ancient Sumerians believed that the Moon was the god Nanna, who was the father of Inanna, the goddess of the planet Venus, and Utu, the god of the sun.
- The Soviet Union produced many significant technological achievements and innovations of the 20th century, including the world's first human-made satellite, the first humans in space and the first probe to land on another planet, Venus.
- The ancient Sumerians believed that the sun was Utu, the god of justice and twin brother of Inanna, the Queen of Heaven, who was identified as the planet Venus.
- The planet Venus has a surface that is 90% basalt, indicating that volcanism played a major role in shaping its surface.
- The ISS, like many satellites including the Iridium constellation, can also produce flares of up to 8 or 16 times the brightness of Venus as sunlight glints off reflective surfaces.
- The first was Mariner in the 1960s and 1970s, which made multiple visits to Venus and Mars and one to Mercury.
- The brightest astronomical objects have negative apparent magnitudes: for example, Venus at −4.2 or Sirius at −1.46.
- Both Earth and Venus are known to have quasi-satellites.
- The other terrestrial planets (Mercury, Venus, and Mars) as well as the Moon are believed to have a metallic core consisting mostly of iron.
- In 2013, ESA scientists reported that the ionosphere of the planet Venus streams outwards in a manner similar to the ion tail seen streaming from a comet under similar conditions."
- This includes four terrestrial planets (Mercury, Venus, Earth, and Mars), two gas giants (Jupiter and Saturn), and two ice giants (Uranus and Neptune).
- The name Phosphorus in Ancient Greece was the name for the planet Venus and is derived from the Greek words (φῶς = light, φέρω = carry), which roughly translates as light-bringer or light carrier.
- Uncrewed programs launched the first American artificial satellites into Earth orbit for scientific and communications purposes, and sent scientific probes to explore the planets of the solar system, starting with Venus and Mars, and including "grand tours" of the outer planets.
- Example: On 1 January 2019, Venus was from the Sun, and from Earth, at a phase angle of (near quarter phase).
- Its apparent magnitude reaches −2.94, which is surpassed only by Jupiter, Venus, the Moon, and the Sun.
- The inner terrestrial planets consist of Mercury, Venus, Earth, and Mars.
- When viewed from Earth, Jupiter can be bright enough for its reflected light to cast shadows, and is on average the third-brightest natural object in the night sky after the Moon and Venus.
- Venus and Neptune have even lower eccentricities.
- The four smaller inner planets, Mercury, Venus, Earth and Mars, are terrestrial planets, being primarily composed of rock and metal.
- Jupiter is usually the fourth brightest object in the sky (after the Sun, the Moon and Venus); at times Mars is brighter than Jupiter.
- Basalt commonly erupts on Io (the third largest moon of Jupiter), and has also formed on the Moon, Mars, Venus, and the asteroid Vesta.
- To the Ancient Greeks, some "stars", known as planets (Greek πλανήτης (planētēs), meaning "wanderer"), represented various important deities, from which the names of the planets Mercury, Venus, Mars, Jupiter and Saturn were taken.
- Over a dozen space probes have been placed into orbit around other bodies and become artificial satellites of the Moon, Mercury, Venus, Mars, Jupiter, Saturn, a few asteroids, a comet and the Sun.
- Many other Soviet and Russian space exploration records ensued, including the first spacewalk performed by Alexei Leonov, Luna 9 was the first spacecraft to land on the Moon, Zond 5 brought the first Earthlings (two tortoises and other life forms) to circumnavigate the Moon, Venera 7 was the first to land on another planet (Venus), Mars 3 then the first to land on Mars, the first space exploration rover Lunokhod 1, and the first space station Salyut 1 and Mir.
- On other planets and moons that experience more active surface geological processes, such as Earth, Venus, Mars, Europa, Io and Titan, visible impact craters are less common because they become eroded, buried or transformed by tectonics over time.
- Some terrestrial planets other than Earth also exhibit rocky mountain ranges, such as Maxwell Montes on Venus taller than any on Earth and Tartarus Montes on Mars, Jupiter's moon Io has mountain ranges formed from tectonic processes including Boösaule Montes, Dorian Montes, Hi'iaka Montes and Euboea Montes.
- The word year is also used for periods loosely associated with, but not identical to, the calendar or astronomical year, such as the seasonal year, the fiscal year, the academic year, etc. Similarly, year can mean the orbital period of any planet; for example, a Martian year and a Venusian year are examples of the time a planet takes to transit one complete orbit.
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