How Fast is Earth Moving? It’s A Question of Earth’s Speed and Acceleration

Picture of our solar system, which revolves around the center of the galaxy. Image courtesy of NASA

Earth is in constant motion – it rotates on its axis once every day, revolves around the Sun once a year, and as part of the solar system, orbits the center of the Milky Way Galaxy every 240 million or so years. What is Earth’s speed and acceleration for all of these motions?

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Why Don’t We Feel the Earth Move? Acceleration and Perceived Motion

Earth both rotates on its axis and revolves around the Sun. Why don't we feel the motion? Image Credit: NASA

The Question: If the Earth is rotating on its axis and also revolving around the Sun, why don’t we feel any motion?

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Henrietta Swan Leavitt: Unsung Female Science Pioneer Lauded On Stage

leavitts law helps us measure the universe

Will an unsung astronomy pioneer, Henrietta Swan Leavitt, finally get the credit she deserves? In 1895 Henrietta Swan Leavitt volunteered as an unpaid assistant at Harvard College Observatory. Her work on Cepheid variable stars led to the discovery of galaxies beyond our Milky Way, the expansion of the universe, and the big bang. Leavitt’s Law [...]

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Another Solar Geomagnetic Storm Coming March 11, 2012

geomagnetic storm brewing

Are we in danger from the upcoming solar flare? On March 9, 2012 at 03:58 Universal Time (7:28 PM on March 9, PDT) the sunspot, AR 1429, (the same sunspot that gave us the X5 event of earlier this week) unleashed an M6 class solar flare. The resulting Coronal Mass Ejection (CME) will reach earth’s [...]

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New Computer Model of Phobos: Martian Moon’s Gravitational Field

A Closeup Image of Stickney Crater on Phobos imaged by the Mars Reconnaissance Orbiter in March 2008.  Image Credit: NASA

What does Phobos look like? A new computer model of the Martian moon may have the answers. The moons Phobos and Deimos, fear and panic, are fitting companions for Mars, the god of war. With all the attention that space agencies have paid to studying Mars, the Martian moons have received relatively little attention. With [...]

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