How to see every planet in the solar system at once this week

For a few evenings around 28 February, every planet in the solar system will be visible in the night sky, thanks to a rare great planetary alignment. Here's how to make sure you don't miss this planetary parade.

All of our solar system’s planets are lining up in the night sky at once this week. This extraordinary celestial event will see the sky scattered with seven visible planets in what is known as a great planetary alignment, or a “planetary parade”.

The eight planets in our solar system orbit the sun in roughly the same plane because they all originally formed from the same  around the sun. The line the sun traces across the daytime sky – called the ecliptic – aligns with this plane, so when the planets appear in the sky, they all appear roughly along the ecliptic. It isn’t a perfect line of planets, because their orbits are tilted slightly, but it is fairly close.

Never is this more apparent than during a planetary alignment. Typically, only a few planets share the night sky, but an unusual alignment of all seven planets will be visible for a few evenings around 28 February, depending on your location.

The best time to look is right after sunset, with a chance to see all of the planets stretching in an arc across the sky, though all of them except Mars, Jupiter and Uranus will be close to the horizon. Those three will continue to hang around for most of the night, while by the time the sky is completely dark, Mercury and  will have sunk below the horizon, with Neptune and Venus following shortly after.

The main thing preventing such alignments from being visible all of the time – aside from weather – is the difference in orbital periods among the planets. Mercury, which is closest to the sun, takes about 88 Earth days to complete an orbit, while Neptune, which is most the distant planet, takes nearly 165 Earth years.

A great alignment is possible only when the planets are all relatively far from the sun, so they are visible at night, and all in approximately the same half of the sky, so they can be seen at the same time. It is a remarkable orbital coincidence – sometimes there are multiple great alignments in a year, and sometimes several years pass without a single one. A similar event isn’t due to occur until 2040.

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