5 February 2011New START Enters ForceBarack Hussein Obama
New START enters into force after the United States and Russia exchange instruments of ratification.
Historical records for United States of America in 2011, rendered directly from the World History Database and ordered by month, day and event.
New START enters into force after the United States and Russia exchange instruments of ratification.
MESSENGER fires its main engine and becomes the first spacecraft to enter orbit around Mercury.
MESSENGER begins its primary year-long orbital science campaign to map Mercury and study its composition, magnetic field and environment.
Announces final Gravity Probe B results confirming geodetic precession and frame dragging around Earth.
A Hubble search led by Mark Showalter discovers a fourth moon of Pluto, later named Kerberos.
A follow-up Hubble image confirms the newly detected fourth Pluto moon.
Hubble images commemorate Neptune completing its first full orbit around the Sun since its discovery in 1846.
A further Hubble observation again confirms the fourth Pluto moon and strengthens its orbital solution.
Juno launches to investigate Jupiter's origin, interior, atmosphere and magnetosphere.
Releases Lulu, a collaborative album with Metallica based on writings by Frank Wedekind.
Receives the Congressional Gold Medal with other Apollo 11 astronauts.
Backs the GCC initiative for a peaceful Yemeni transition.
Supports the negotiated transfer of power from Saleh.
Marks the end of the U.S. military mission in Iraq.
Receives the Best Actress Oscar for Black Swan.
Winner of the Academy Award for Best Actress in The Iron Lady
Uses improved distance and orbital modelling to refine the dynamical mass of the black hole in Cygnus X-1.
Co-leads continuum-fitting measurements indicating that the black hole in Cygnus X-1 has near-extreme spin.
Measures the trigonometric parallax and proper motion of Cygnus X-1, enabling substantially improved estimates of the system's distance and black hole properties.
Directs J Edgar, a biographical drama about FBI director J Edgar Hoover.
MESSENGER's orbital cameras begin systematic high-resolution imaging designed to produce complete global coverage of Mercury.
MESSENGER reveals bright, shallow and irregular depressions on Mercury that the science team names hollows.
MESSENGER results establish that Mercury's internal magnetic field is about one hundred times weaker than Earth's field.
Orbital measurements show that Mercury's magnetic field is strongly offset northward along the planet's rotation axis.
Shares the Nobel Prize in Physiology or Medicine for discoveries concerning activation of innate immunity.
Shares the Nobel Prize in Physics for discovering the accelerating expansion of the Universe through observations of distant supernovae.
Shares the Nobel Prize in Physics for discovering the accelerating expansion of the Universe through observations of distant supernovae.
Perlmutter receives half of the 2011 Nobel Prize in Physics for discovering the accelerating expansion of the universe through observations of distant supernovae.
Riess shares the 2011 Nobel Prize in Physics for the supernova observations that revealed the accelerating expansion associated with dark energy.
Armstrong announces his retirement from competitive cycling
Publication of "The Art of Fielding"
Her performance as Celia Foote in The Help earns Chastain her first Academy Award nomination.
Publication of "The Tiger's Wife"
This page is generated from stored World History Database records matching the exact country and year shown above. Exact duplicate display records are collapsed. Records without a month are listed after the monthly sections. Source provenance varies by record; formal academic citation should be checked against the relevant primary source, archive or specialist historical reference.