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Exoplanetary parade: What would the evening sky appear to be on alien worlds? (op-ed)

February 25, 2025
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Exoplanetary parade: What would the evening sky appear to be on alien worlds? (op-ed)
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When you’ve got a transparent view of the evening sky on the finish of February, you can see all of the planets within the photo voltaic system with the bare eye, lined up in a “planetary parade.” However what would these planetary alignments appear to be when you may stargaze from extraterrestrial worlds?

Proper now, six of the seven planets — not together with Earth — are seen to the bare eye. If you will get away from town lights and if it isn’t too cloudy, tonight it is possible for you to to search for and see Venus, Mars, Jupiter, Saturn, Uranus and Neptune. You may add Mercury — the smallest of all of the planets in our photo voltaic system — to that bucket listing later this month.

All of the planets revolve round the solar in the identical airplane, which astronomers name the ecliptic. As they pace by their orbits in live performance, the distances between every pair of planets develop and shrink. After we search for at the evening sky, how brilliant the planets seem will depend on how shut they’re at that exact second in time.

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On the finish of February, all of the planets will probably be shut sufficient to Earth to be seen with the bare eye. As a result of all of them orbit within the ecliptic airplane, we see them in an impressive arc throughout the evening sky — the nice parade.

Associated: Planetary parade February 2025: When, the place and easy methods to see it

Beautiful views of Jupiter from Europa

There’s an abundance of rocky worlds all through our photo voltaic system, from the rocky planets to the moons round our gasoline and ice giants. Europa is among the closest moons of the gasoline large Jupiter. Scientists consider that there’s a subsurface ocean beneath Europa’s icy shell that accommodates more water than all of Earth’s oceans combined.

What views of the evening sky would we’ve got if we had developed on Europa as an alternative of on Earth?

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Sadly, we might by no means get to see all of the planets in alignment; in actual fact, we might by no means get an unaided view of Mercury.

Nonetheless, any planetary alignment seen from Europa — any view of the evening sky in any respect, for that matter — would look nothing like what we’re used to wanting up and seeing right here on Earth.

The scale of a celestial object within the evening sky will depend on each its bodily measurement and — simply as importantly — its distance from the observer.

Stargazing from Europa, Jupiter would look 20 occasions bigger than the scale of the moon we see in our personal evening sky. The Nice Crimson Spot alone could be larger than the solar!

Weird because it appears, the solar would solely seem as a faint orange glow, 5 occasions smaller than for us right here on Earth.

Dazzling and ever-changing planetary parades from TRAPPIST-1

We’ve found 1000’s of planets orbiting stars outside of our own solar system. Taking our hypothetical stargazing state of affairs a step additional, what if we may have a look at the evening sky from certainly one of these extrasolar worlds?

An beautiful seven-planet system orbits across the star TRAPPIST-1. TRAPPIST-1 is a crimson dwarf; because the identify suggests, it is a lot smaller and redder than the solar. The orbits of all seven planets would match contained in the orbit of Mercury round our personal solar. As a result of they orbit so shut, every planet revolves round TRAPPIST-1 a lot quicker than the period of time it takes Earth to revolve across the solar.

If we had developed on TRAPPIST-1 b — the closest planet within the system — you’d have the ability to step exterior and see planetary parades of the opposite six TRAPPIST planets each few days. However these alignments could be way more breathtaking than any views we get right here on Earth.

You’d have a blinding backdrop of the crimson dwarf TRAPPIST-1, seeing it 10 occasions bigger than the solar appears to us. You’d additionally have the ability to watch planets vanish behind the crimson dwarf after which develop bigger than the moon each few days. You can sit again and revel in an ever-changing planetary menagerie.

Verdict

So, the place is the very best place from which to stargaze? Possibly Earth is particular. It simply so occurs that life developed on a planet the place we are able to search for on the evening sky and once in a while see all the opposite planets in our photo voltaic system.

I believe I might fairly search for shut at Jupiter each evening.



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