Scientists from the Harvard–Smithsonian Center for Astrophysics estimate that there are at least 17 billion planets approximately the size of Earth in the Milky Way.
The China Manned Space Engineering Office says that remnants of the Chinese Long March-5B Y2 rocket made an uncontrolled re-entry into Earth's atmosphere into the Indian Ocean, just west of the Maldives.
Binary Aten asteroid (66391) 1999 KW4 and its minor-planet moon make their closest-ever recorded flyby of Earth at 3.2 million miles away. The asteroid will approach even closer at 0.0155 AU (2,320,000 km) from Earth in 2036, and is the largest asteroid to approach Earth until (4953) 1990 MU in June 2027.
NASA astronomers use the Hubble and Spitzer space telescopes in research implying that "hot Saturn" (high surface-atmosphere temperatures and gas giant-mass) exoplanet WASP-39b, located 700 light-years from Earth, has a large amount of water molecules in its atmosphere.
Astronomers say they have observed bizarre light patterns using the Kepler Space Telescope from a star that appears old, but is shrouded in debris like a much younger star, roughly 1,500 light-years away. This has led to speculation that these are an "artificial extraterrestrial mega-structure", orbiting the star known as KIC 8462852 in the Cygnus constellation. KIC 8462852 lies just above the Milky Way between the constellations Cygnus and Lyra. It first attracted the attention of astronomers in 2009 when the Kepler Space Telescope identified it as a candidate for having orbiting Earth-like planets.
NASA's Mars Reconnaissance Orbiter finds the Beagle 2 spacecraft that disappeared in 2003 intact on the surface of Mars. An error had stopped the spacecraft's solar panels from working and communicating back to Earth.