Galactic Outer Space Party (adult party guide)
Hello, and welcome to our newest party theme guide! Glactic Outer space is a fantastic party theme because it’s:
- Creative and magical
- Inclusive so that everyone can understand it
- Has iconic associated dress styles, themes and expectations
- Lends itself to fantastic decorations
In this post, we will cover great ideas for throwing an adult galaxy-themed party. We list suggestions for decorations and entertainment at a celestial party, costumes for a space and astronomy theme, and food and drink ideas with galaxy-themed twists.
We also share a planning process and timeline for planning the ultimate galaxy theme party.

Parties Universe is a brand built around gorgeous, creative DIY party ideas. In addition to our creative ideas, we know a lot about events and have also created the ultimate guides to decoration, entertainment, music, food, and drinks for any party, which you might like to check out!
This goes into much more detail about the effects of different creative and technical set-ups and will give you a great overview (from professionals!) about how to create an incredible party atmosphere!
Decoration Ideas for a Galactic Outer Space party
Theme/ colour palette ideas for a galaxy party
We love to arrange parties around a 2 or 3 colour palette that goes with the theme. This is a great way to easily tie in decorations and make the space look cohesive. It’s nice to have a mix of contrasts and also of quality, for instance, by mixing in gold and silver accents.
Here are some of our suggestions for how we might colour scape a galaxy themed party:
- Deep blue, white and silver
- Deep blue, turquoise and silver
- Deep purple, blue and silver or gold
- Black and purple or black and turquoise
- Black and turqoise with silver or white
- Black, deep pink and dark purple
- Black, turqoise and pink
- Black, white and silver
Draping to decorate an intergalactic or space theme party
A very strong look for party decoration is to use draping to instantly transform a space. You can drape across main walls or use draping to create party zones, and you can even get creative and have some ceiling raping creating a tent style effect in a space.
This is one of our biggest tips, and its a great way to add texture to a space. Here are some ideas for galaxy themed draping:
- Tule of chiffon Navy, deep purple or black
- Multicoloured glitter black tule
- Sequin drapery in silver, purple or turquoise
- Metallic fabric looks in silver or purple shades
- Black/purple/blue or silver bead curtains
Decorative props for a galaxy party
A few showstopper themed props are also a striking look for a party, and they are great fun to plan and create! For the space theme, we think these ideas would suit perfectly:
- Disco ball towers
- Mirrors
- Chalkboards with Space theme puns and signage
- Hanging globe-style coloured balls
- Hanging stars

Decorative lighting effects for a galactic space party
- Icycle or fairy lighting would be perfect for this theme, particularly in cool white colours to mimic magical stars
- Low-level upward lighting is a great decorative prop to create a magical, intimate feel, and this can be easily adapted to the galactic theme with colourful purple or turquoise LEDs
- Pin lights and spotlights also have striking decorative features that suit this theme perfectly (think space beam/sun ray or any light reflecting in a beam of a shuttle!) If you can find bright white/blue spotlight effects, it would have a great effect on the feel of the space
- Reflections and mirrors are also perfect for a galaxy theme; play around with handing mirrors, mirror balls and fabrics that will dazzle in the light. Just text before guests arrive to say that none of these reflections are too strong
- Space projection, galaxy lights. You can buy small light projectors that will project galaxy-effect stars onto the ceiling in beautiful swirly motions, and these would be stunning decorative features for the party space. They work well with low-level lighting so that ceilings remain dark, and the lights really make an impression.
- Screens with space projections are perfect for this party theme and will be fantastic as part of your decorations! You can do this in many ways, but it could even be as similar as projecting some YouTube videos of starry skies or space shuttles!
- Mist or Haze machine to add a whimsical, magical and weightless glow to the space. This would be a stunning effect, particularly as the guests arrive. They are not hugely expensive to hire, but they instantly transform the feel of a space!
Entertainment ideas for a galaxy theme party
We never throw a party without some entertainment plans….these can be as simle or as elaborate as you like, but having something interactive, impressive or memorable will really elevate this event!
We are giving you suggestions for a range of entertainment that perfectly fits the galaxy theme, including live music, performers, interactive entertainment and food related entertainment in these sections below!
Live music for a galaxy party
- Acoustic, soulful and space-enhancing
- Electronic DJ set with interesting cosmic sounds and interspersed space audio from famous lanches to bring nostalgia and atmosphere to the room.
- Didgeridoo-style whimsical sounds to start the night
- Brass band music also suits the scene in my vision… it’s great and powerful but has a slightly empty feeling tonal value that would be a great addition to this theme
Space theme entertainment performers to mingle
- Fire performers such as jugglers, hoop artists and ribbon artists would be perfect for this theme and would make spectacular mingling entertainment!
- Any type of artistic circus performer, such as acrobats and aerialists, would be perfect for this type of party….bringing in someone who performs suspended in space will drag the attention upwards in your room and create a magical, zero gravity-style feeling.
- Astrologists or fortune tellers would be a great play on this theme and create a magical atmosphere as they travel around the room interacting with the guests. If you’re into this, you could also have birth star charts and astrological readings on the wall for each start sign for guests to interact with during the party!
Interactive entertainment for a space-theme party
- A sparkler moment: gather guests outside to play with sparklers and add spectacular fiery light to the space in a fun and playful way! This is always a spectacular idea for a party!
- Body glitter station: Have body glitter stations to allow guests to create artistic decorations on themselves and become arty of the sparkle of the evening! You can also have demos of little space theme designs and face pains they can use to create amazing space-style costume decorations.
- Have an astrology chart station where guests can track their star signs and read their horoscopes for the evening! This is a fun and enchanting addition to a party—if nothing else, it creates a great talking point!
- Create a galaxy interactive wall art with a huge black canvas or sheet where guests can add a star, galaxy or installation in glowing or neon-coloured ink. This is such a great idea because the canvas art will evolve over the course of the night, making it a great talking point and a fun timeline for guests to see develop!
- Carboard-out and space photo props create spaces where guests can take super fun pictures, for instance, beside cut-out astronauts or in models where you can put your face through a hold and be pictured as a character.
- Sparkly streamer handouts for guests to pop, creating space-style trails of colourful or silver strings, mimicking shooting starts, and projecting the focus in the room upwards to where these streamers are popping and flying ahead! This is a fun and interactive way to add to the decoration and atmosphere of the event!
Having live food artists is a cool form of entertainment! For a space theme, we have loads of visions that could be so cool:
- Galactic Mixologist: Creating space-themed cocktails with dry ice effects, glowing drinks, and galaxy-inspired colours. This is a great way to serve creative and very memorable drinks…it’s also fun, and watching skilled cocktail artists is fantastic entertainment. It’s definitely a talking point!
- Cosmic Candy Floss Spinner: Serving candy floss in galaxy colours like purple, blue, and pink, possibly with edible glitter.
- Astro Ice Cream Roller: Make rolled ice cream with toppings like “moon rocks” (candied nuts) and “stardust” (edible glitter). You could swap this out with frozen yoghurt or regular ice cream!

Dress code ideas for a Galaxy party
There are loads of dress code themes for this party; it is full of fun ideas:
Space sparkle or Galaxy glam
If you want guests to dress stunningly, or this is for an elegant and sophisticated party, then space sparkle or galaxy glam would be a great theme. Have guests come in sequins and rich metallic fabrics and feel elegant make-up looks. Here are some suggestions:
Starry evening gowns, cocktail dresses, space crowns or headpieces, glittering jewellery, metallic footwear, astral makeup, elegant gloves, ethereal capes or shawls, bright, sparkling accessories
Galaxy dress-up theme
Galaxy Space is a perfect theme if you love a fun costume party! You could provide gusts with some inspiration, for instance:
Planets, sun, moon, nebulous, eclipse, astronaut, aurora borealis, a comet, a shooting star.. and loads more like this!
Sci-fi movie theme
Another really fun galaxy-themed costume prompt is a sci-fi movie-themed dress-up. Have guests dressed as characters from classic sci-fi movies! This theme lends itself to a costume competition! Here are some fun ideas:
- Captain Kirk: Uniform, badge, black boots
- Princess Leia: White gown, belt, hair buns
- Darth Vader: Armor, cape, helmet, lightsaber
- Spock: Vulcan ears, blue uniform, black boots
- Stormtrooper: Armor, helmet, blaster
- Ripley (Alien): Spacesuit, name tag, boots
- Han Solo: Vest, white shirt, blaster, boots
- The Mandalorian: Armor, helmet, cape
- Star-Lord: Red jacket, blasters, headphones
- Loki: Helmet, green and gold outfit, cape
- Nebula: Blue skin, cybernetic enhancements, leather outfit
- Gamora: Green skin, leather attire, sword
- Thor: Cape, hammer (Mjolnir), armour
- Rocket Raccoon: Orange jumpsuit, blaster, goggles
- Groot: Tree-like costume, branch-like accessories
- Leeloo (The Fifth Element): Bandage outfit, orange wig
- Space Scientist: Lab coat, glasses, futuristic gadgets
- Alien: Metallic jumpsuit, antennae, green skin
- Astronaut: Spacesuit, helmet, gloves
- Space Princess: Shimmery gown, tiara, gloves
- Galaxy Warrior: Armor, futuristic weapons, face paint
Astrology theme
Another epic dress-up theme for a galaxy theme party would be an astrology theme. Some are dressed as star signs or iconic astrological constellations or symbols, and this sends itself to such fun and creative ideas! For example, some fun suggestions could be:
- Celestial Goddess: Flowing gown, celestial accessories like moon and star jewellery
- Astrologer: Robe, telescope, star chart accessories
- Sun: Bright yellow or gold outfit, sunbeam headpiece
- Moon: Silver or white outfit, crescent moon headpiece
- Star: Star-shaped costume, glittering makeup
- Planet: Costume themed around a specific planet (e.g., red for Mars, rings for Saturn)
- Milky Way: White and silver outfit, galaxy print, glitter
- Galactic Sorcerer: Mystical robes, staff, constellation motifs
- Aurora Borealis: Flowing multicoloured dress, sparkling accents
- Supernova: Bright, explosive colours, reflective materials
- Eclipse: Half dark, half light costume, sun and moon motifs
Constellation Costume Ideas
- Orion: Wear a star-patterned outfit, with a belt detail to represent Orion’s Belt, and carry a bow or shield.
- Ursa Major (Big Dipper): Outfit with star placements highlighting the Big Dipper pattern, perhaps with a bear theme.
- Cassiopeia: Elegant, queenly attire with a star crown or starry pattern dress representing the ‘W’ shape of the constellation.
- Draco: Dragon-themed costume with scales and starry accessories to represent the dragon shape.
- Pegasus: White or silver outfit with wings, representing the winged horse.
- Andromeda: Ethereal dress, chains or bound hands accessories, and starry patterns to represent the mythological princess.
- Scorpius: Outfit with a scorpion motif, perhaps with a tail accessory and starry patterns.
- Leo: Lion-themed costume with a mane, golden outfit, and star details.
- Taurus: Bull horns, earthy tones, and starry accents on the outfit.
- Aquila: Eagle-themed costume with wings, feathery accessories, and star details.
- Cygnus: Swan-themed outfit with white feathers, wings, and a starry crown.
- Gemini: A dual-coloured outfit representing the twins, with mirrored accessories or twin symbols.
- Hydra: Snake-themed costume with multiple heads, scales, and a starry design.
Zodiac Sign Costume Ideas
- Aries: Ram horns, red clothing, and bold accessories, perhaps with a flame motif.
- Taurus: Bull horns, earthy green or brown tones, and floral accents.
- Gemini: A dual-themed costume with contrasting colours or a mirror image outfit.
- Cancer: Crab claws, moon-themed accessories, and soft, watery colours like silver or light blue.
- Leo: Golden outfit with a lion mane headpiece and sun-themed jewellery.
- Virgo: Elegant, modest attire with a nature or harvest theme, floral or wheat accessories.
- Libra: Scales of justice accessories, balanced and harmonious outfits, often in pastel colours.
- Scorpio: Dark, mysterious attire with a scorpion motif, perhaps a tail accessory.
- Sagittarius: Archer costume with a bow and arrow, centaur or horse elements, adventurous attire.
- Capricorn: Goat horns, earth-toned outfit, with a sea or water element to represent the sea goat.
- Aquarius: Water-bearer theme with blue, flowing garments and water jug accessories.
- Pisces: Fish-themed costume with flowing, ocean-coloured fabrics and fish scale patterns.

Cocktails to serve at a galaxy themed party
The best way to incorporate a theme into a drinks manu is to serve classic cocktails and mixer drinks but add a little space theme twist!
For a space theme party, rich blues and purples are perfect colours so think about making up big pitchers of blackcurrant or blueberry flavoured soft drinks, full of berries, grapes and ice for guests to enjoy.
Other space cocktail idea with a twist could include adding blue curacao liquer for colour, sprinkling with adible glitter, using special cocktail glasses for serving, star or planet shaped ice cubes, and adding in a swirl of coconut milk for the opaque galactic look.
- Starry Nightcap
- Nebula Nectar
- Galactic Glamour
- Cosmic Cosmo
- Milky Way Mule
- Celestial Sangria
- Astro-tini
- Celestial Spritz
- Moonlight Martini
- Zodiac Zest
- Stellar Sour
- Starburst Mojito
- Comet Cooler
- Taurus Tonic
- Scorpio’s Sting
- Capricorn Cooler
- Aquarius Quencher
Food ideas for a space theme party
Here are some fun ideas to get your imagination flowing for astrology-themed foods to serve. Some are more high-end, and some more tacky and fun, but ultimately, you can see what might suit your guests and how best to incorporate them into food if that’s what you want to do!
Food presentation and serving suggestions:
One of the key factors in prepping food for a party is the layout of the foodtable, and the cosmic theme makes for a brilliant food display.
Gerneally we like to serve really good quality food, and perhaps add one or two gimmicky theme food alongside. Rather than going overboard with food theme, we love to add dazzle to the decorations.
For a cosmic theme, consider huge metallic serving bowls, metallic look, crystal glass or matt black crockery.
One of the keys of a stunning serving table is to use height well, so you can build up a structure with different height serving trays or by balancing players atop uptunred bowls. Use black or metallic fabric as table boths or as a runner interspersed between the serving trays.
To add extra sparkle, you could:
- Scatter little star confetti over the table cloth
- Use cocktail sticks to add the occasional space style decoration (such as silver cut out rocket forms) into the food serving
- Have little floating centrepieces on the table to tie in the zero gravity theme (such as candles)
- add to the zero gravity theme with helium balloons straegically placed at the back of the table to add even more height and draw the eye upwards for a very impressive food table look
We love a little details like a rocket handly on a serving spoon or star themes napkins, so think about little touches like that too!

Galaxy Theme Snacks:
- Stardust Popcorn: Popcorn tossed with edible glitter and colourful sugar crystals.
- Starry Fruit Skewers: Skewers of fresh fruit with a galaxy-colored glaze and star-shaped fruit pieces (these can be cut using a cookie cutter!)
- Galactic Jelly Shots: Jelly shots layered in cosmic colours with edible glitter.
- Orbiting Olives: Skewers of olives, cheese, and vegetables, arranged sticking out of a half sphere-shaped item, such as half melon, or some other orbital strcture
- A cheese platter using all shades of white, blue, and purple, such as blueberries and black grapes, deep red salamis, a mix of cheese, including blue cheese, and black salted crackers to accompany.
Galaxy Theme Sweets:
- Galaxy Donuts: Donuts with a galaxy glaze, featuring swirls of purple, blue, and black icing, and star-shaped sprinkles.
- Galaxy chocolate bark: Made of white chocolate with swirls of natural blue and purple food dye folded in, and edible glitter sprinkles or silver star and ball sprinkles.
- Galaxy chocolate drizzle on ice cream bowls!
How to plan a Galaxy theme party
This party has incredible potential, and the planning stage is truly exciting! Just be sure to keep an eye on the time, space, and budget for all your ideas to make the most of your efforts.
To help with your party planning, here are some top tips for organizing and hosting:
Creating the Best Party Atmosphere:
- Enjoy the Moment: The best parties happen when the hosts are having fun too! Delegate preparations to ensure you’re ready to greet guests as soon as they arrive.
- Quality Sound: Ensure high-quality sound and assign someone who excels at creating the right atmosphere and managing the party’s energy. Keep the volume at a comfortable level.
- Energy Boost: Plan a shift in energy for about 2/3 of the way through the party. This could involve handing out sparklers, serving dessert, changing the music, hosting a show or speeches, or moving to the dancefloor. This keeps the party dynamic and engaging.
Planning a Brilliant Party:
- Focus on Impact: Prioritize tasks that will have the most significant impact and address them well in advance. Make a detailed list of tasks for a month before, a week before, the day before, and the morning of the party.
- Delegate and Thank: Enlist friends or family to help with setup. Their support can make the process smoother. Show appreciation by providing food and drinks.
- Prep in Advance: Only serve food that can be prepared ahead of time. If needed, arrange for extra fridge or oven space from neighbors or nearby friends and family.
Good luck with your party planning! We hope these tips help you create a fantastic event.
We would love to hear how you get on,
Zoe xx