Graphical timeline of the Big BangW
Graphical timeline of the Big Bang

This timeline of the Big Bang shows a sequence of events as currently theorized by scientists.

Ballistic Missile Defense OrganizationW
Ballistic Missile Defense Organization

The Ballistic Missile Defense Organization (BMDO) was an agency of the United States Department of Defense that began on 20 May 1974 with the responsibility for all U.S. ballistic missile defense efforts.

List of Justices of the Supreme Court of Canada by court compositionW
List of Justices of the Supreme Court of Canada by court composition

The Supreme Court of Canada, the highest court of Canada, and the final court of appeals in the Canadian justice system, is composed of nine justices—a chief justice and eight puisne judges—appointed by the Governor General-in-Council. Altogether, 88 persons have served on the Court since it was created in 1875; during this time there have been 18 chief justices.

Timeline of political parties in the United KingdomW
Timeline of political parties in the United Kingdom

The following timeline of political parties in the United Kingdom shows the period during which various parties were active, from their date of establishment to their date of dissolution. Defunct parties are shown in green, and currently active parties are shown in pink. An asterisk or dagger indicates that the exact year of establishment or dissolution, respectively, is not certain. Where a party has changed its name over the course of its existence, only the most recent name is given.

List of prime ministers of CanadaW
List of prime ministers of Canada

The prime minister of Canada is an official who serves as the primary minister of the Crown, chair of the Cabinet, and thus head of government of Canada. Officially, the prime minister is appointed by the Governor General of Canada, but by constitutional convention, the prime minister must have the confidence of the elected House of Commons. Normally, this is the leader of the party caucus with the greatest number of seats in the house. But if that leader lacks the support of the majority, the governor general can appoint another leader who has that support or may dissolve parliament and call a new election. By constitutional convention, a prime minister holds a seat in parliament and, since the early 20th century, this has more specifically meant the House of Commons.

Timeline of three longest supported deck arch bridge spansW
Timeline of three longest supported deck arch bridge spans

This is the timeline of the 3 longest supported deck arch bridge spans in the world, where the road deck lies on top of the arch. The deck is supported by columns, truss, rubble or lies directly on the arch. These bridges are often found in narrow valleys.

List of justices of the Supreme Court of the United States by court compositionW
List of justices of the Supreme Court of the United States by court composition

The Supreme Court of the United States is the highest ranking judicial body in the United States. Established by Article III of the Constitution, the detailed structure of the Court was laid down by the 1st United States Congress in 1789. Congress specified the Court's original and appellate jurisdiction, created 13 judicial districts, and fixed the initial size of the Supreme Court. The number of justices on the Supreme Court was changed six times before settling at the present total of nine in 1869. A total of 114 justices have served on the Supreme Court since 1789. Justices have life tenure, and so they serve until they die in office, resign or retire, or are impeached and removed from office.