Earth and Mars to scale in terms of size and color. Mars is shown in winter, with polar icecaps.... [+]
Relative to the stars in the sky, planets generally move slightly towards the east from night-to-night.
The retrograde motion of Mars relative to the background stars from March to May, 2014. Image... [+]
But beginning tonight, Mars will move to the west, commencing retrograde motion, which continues until June 30th.
The geocentric (L) and heliocentric (R) pictures of our Solar System. The planets all orbit the Sun... [+]
This isn't due to Mars changing its motion, but rather to Earth, orbiting inner to Mars, overtaking it due to Earth's faster path around the Sun.
Earth's and Mars' orbits, to scale, as viewed from the Solar System's north direction. Image credit:... [+]
Both orbits are elliptical, and Earth is approaching aphelion, our farthest point from the Sun, while Mars approaches perihelion, its closest.
Mars as seen from the Hubble Space Telescope, with its polar icecap and clouds. Image credit:... [+]
On May 30th, Mars will be only 0.51 A.U. (or 76 million km) from Earth, the closest our two worlds have been since 2005.
Earth, as seen from the surface of Mars by the Curiosity rover on January 31, 2014. Image credit:... [+]
Summer approaches on both worlds: Earth's from its axial tilt, pointing one hemisphere towards the Sun; Mars' owing to its orbit's ellipticity, as it receives 45% more sunlight at perihelion than aphelion.
Mars pre (L) and post (R) dust storm, which are common occurrences during the martian summers. Image... [+]
Mars rises in the southeast around midnight, providing outstanding views through a telescope.
Varying views of Mars near opposition over the course of many years, from 1995-2005. Image credit:... [+]
Twice the Moon's diameter but 200 times as distant, Mars is always point-like to human eyes.
Even at its closest, Mars (lower left) still appears nearly 100 times smaller than the Moon. Image... [+]
The only superior show comes in July of 2018, when Mars comes within 0.386 A.U. (58 million km) of us, appearing its largest and brightest until 2035.
Mostly Mute Monday tells the story of a single astronomical phenomenon or object primarily in visuals, with no more than 200 words of text.
