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Artist's conception of a white dwarf, right, accreting hydrogen from the Roche lobe of its larger companion star A nova (pl. novae or novas) is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star (hence the name "nova", Latin for "new") that slowly fades over weeks or months.
A study published in 2013 [12] used the Fine Guidance Sensors of NASA's Hubble Space Telescope to measure a precise parallax (and therefore distance and luminosity) for the star. This information was used to estimate an age for the star of 14.46 ± 0.8 billion years.
LHS 475 b is a terrestrial planet orbiting the star LHS 475 which is about 40.7 light years away, in the constellation of Octans. [2] [3] It was the first extrasolar planet to be confirmed by the James Webb Space Telescope. [4] It completes an orbit every 2 days and is 99% the diameter of Earth.
The Space Variable Objects Monitor (SVOM) is a small X-ray telescope satellite for studying the explosions of massive stars by analyzing the resulting gamma-ray bursts, developed by China National Space Administration (CNSA), Chinese Academy of Sciences (CAS) and the French Space Agency , [5] launched on 22 June 2024 (07:00:00 UTC).
Space telescopes that collect particles, such as cosmic ray nuclei and/or electrons, as well as instruments that aim to detect gravitational waves, are also listed. Missions with specific targets within the Solar System (e.g., the Sun and its planets ), are excluded; see List of Solar System probes for these, and List of Earth observation ...
Such an event could theoretically accelerate a star to such high speeds that it becomes a hypervelocity star, thereby escaping the gravitational well of the entire galaxy. [5] In this respect, model calculations (from 1988) predict the supermassive black hole in the center of our Milky Way galaxy to expel one star every 100,000 years on average.
The use of tardigrades in space, first proposed in 1964 because of their extreme tolerance to radiation, began in 2007 with the FOTON-M3 mission in low Earth orbit, where they were exposed to space's vacuum for 10 days, and reanimated, just by rehydration, back on Earth. In 2011, tardigrades were on board the International Space Station on STS-134.
The central star is an oxygen-rich Wolf–Rayet star and is the result of a merger of a CO (carbon-oxygen) white dwarf and an ONe (oxygen–neon–magnesium) white dwarf in a type Iax supernova. This makes IRAS 00500+6713 a confirmed zombie star. Pa 30 and IRAS 00500+6713 is the only known remnant of a type Iax in the Milky Way. [14] [15] [16]