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Mars gears up for its closest approach to Earth in over a decade

“Relative to the stars in the sky, planets generally move slightly towards the east from night-to-night. But beginning tonight, Mars will move to the west, commencing retrograde motion, which continues until June 30th. 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.”

Every two years, Earth passes Mars in orbit, as the inner, faster world overtakes the outer one. This year, it happens when Earth approaches aphelion, its farthest point from the Sun, while Mars approaches perihelion, or its closest approach. On May 30th, the two worlds pass within just 0.51 A.U. (76 million km) of one another, their closest encounter since 2005. While Mars will still appear as no more than a point to unaided human vision, telescopes will provide absolutely spectacular views during the next three months. If you miss it, you’ll have to wait two years for views this good, and then you won’t get them again until 2035.

Go get the whole story – and some amazing pictures – to start your week off right!

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What’s Up for October?

This month is filled with exciting celestial sights. Here are 10 targets you can view this month:

10. Unusual Sunset

During a sunset, our thick atmosphere absorbs most colors of sunlight, but red light is absorbed the least. Rarely, green flashes can be seen just above the sun’s edge. As the last sliver of the disk disappears below the horizon, be sure to watch its color.

9. Belt of Venus

Just after sunset, turn around and face east. A dark shadow will move up from the horizon and gradually cover the pinkish sky. This is caused from the Earth itself blocking the sunlight and is called the Earth Shadow or the Belt of Venus.

8. Crepuscular Rays

Also just after sunset, or before dawn, you may see rays of sunlight spread like a fan. These are called crepuscular rays and are formed when sunlight streams through gaps in the clouds or mountains.

7. Aurora Borealis

The northern lights, also known as the aurora borealis, are caused by collisions between gaseous particles in Earth’s atmosphere and charged particles released from the sun. The color of the lights can changed depending on the type of gas being struck by particles of solar wind. You can find out when and where to expect aurorae at the Space Weather Prediction Center.

6. Andromeda Galaxy

Did you now that The Andromeda Galaxy is one of the few you can actually see with your naked eye? In October, look nearly overhead after sunset to see it! This galaxy is more than twice the apparent width of the moon.

5. Moon Features

Nights in mid-October are excellent for viewing the features on the moon. Areas like the Sea of Tranquility and the site of the 1969 Apollo 11 landing will be visible.

4. A Comet

This month, the European Space Agency’s Rosetta mission target, a comet with a complicated name (Comet 67P Churyumov-Gerasimenko), is still bright enough for experienced astronomers to pick out in a dark sky. On October 9, you may be able to spot it in the east near the crescent moon and Venus.

3. Meteor Showers

There are multiple meteor showers this month. On the 9th: watch the faint, slow-moving Draconids. On the 10th: catch the slow, super-bright Taurids. And on the 21st: don’t’ miss the swift and bright Orionids from the dust of Comet Halley.

2. Three Close Planets

On October 28, you’ll find a tight grouping of Jupiter, Venus and Mars in the eastern sky before sunrise.

1. Zodiacal Light

The Zodiacal light is a faint triangular glow that can be seen from a dark sky after sunset or before sunrise. What you’re seeing is sunlight reflecting off dust grains that circle the sun in the inner solar system. These dust grains travel in the same plane as the moon and planets as they journey across our sky.

For more stargazing tools visit: Star Tool Box

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Hubbles Jupiter and the Amazing Shrinking Great Red Spot

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You just scrolled over a high-res segment of the Andromeda galaxy.

The planets, moons and Death Stars seen in the original (theatrical) Star Wars trilogy to scale.

Alderaan, famous for being destroying in A New Hope, is the closest in size to the Earth with a diameter of 12,500 km vs Earth’s 12,742 km average diameter.

Hoth is larger, but still the closest in size to Mars, with a diameter of 7,200 km vs Mars’ 6,779 km.

Endor, the smallest of the bodies to appear in the original trilogy, has a diameter of 4,900 km which makes it very slightly larger than our solar system’s smallest planet, Mercury which has a diameter of 4,879 km.

Of the gas giants seen in Star Wars, Bespin is very similar in size to Saturn (116,464 km average diameter) but is still quite a bit smaller than Jupiter (139,822 km), which in turn is much smaller than Yavin Prime, the largest planet to appear in the original trilogy.

http://space-facts.com/planets-moons-star-wars/