Out of this World Galaxy DIY Bath Bombs

Learn how to make bath bombs that are out of this world.

Out of this World Galaxy Bath Bombs
Out of this World Galaxy Bath Bombs
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Get ready for the outer space puns, because we're pretty sure that these are the best bath bombs in the galaxy.

Galaxy crafts are really popular right now, and it's easy to see why. There's something about the swirling colors and glittery decorations that's simply out of this world. We're also always up for a little bit of nostalgia, and crafts like these remind us strongly of the 90s. Maybe we'll come up with a color-changing bath bomb next!

Anyway, we're over the moon for these galaxy bath bombs. The colors will remind you of the night sky, and we have tips below for how you can add glitter for a star-spangled effect. They are also super easy to make, so you are only a few hours away from relaxing in the tub with your very own DIY bath bomb.

Pro Tips

How to Store Bath Bombs
Despite the beautiful displays at many soap stores, you actually don't want to store your homemade bath bombs out in the open. Instead, store them in an airtight bag or container. Otherwise, over time your bath bombs will actually absorb the moisture that is in the air, and they will lose their fizz.

How to Choose Essential Oil Blends
We love using lavender in these galaxy bath bombs, but you can use many different fragrances depending on your preference. If you're looking for some extra energy, you can use orange or lemongrass. If you're trying to escape a headache, ylang ylang can be a great solution. Check out our complete guide to essential oils to learn more and to find more great ideas.


Estimated Cost$11-$20

Time to CompleteIn an evening

Primary TechniqueBath and Beauty


Materials List

  • 1 c. baking soda
  • .5 c. citric acid
  • .5 c. Epsom salt
  • 3 teaspoons oil (we used melted coconut oil)
  • 1 tsp water
  • 1 tsp essential oil (we used lavender)
  • A few drops of food coloring
  • Bath bomb mold
  • 3 medium bowls for mixing up your ingredients and coloring your baking soda mixture

DIY Galaxy Bath Bombs


  1. In one of your bowls, combine your dry ingredients: baking soda, citric acid, and Epsom salts. Mix well, making sure everything is evenly distributed.

  2. Add your oil and a few drops of essential oil. Stir to combine. It should be about the consistency of wet sand.

    If your mixture is still a little dry, you can add the water a few drops at a time (if you put it all in at once it will fizz, which we don't want yet!).

  3. Divide your mixture into 3 bowls so that you can make 3 different colors.

  4. Add a few drops of food coloring to each bowl. We made blue, purple, and pink. Add more food coloring for more intense colors.

  5. Layer your colors into your bath bomb mold. You can also go for a swirl effect if you would like!

  6. Use your hands to tightly pack the mixture into both halves of your bath bomb mold. Then press those halves together so that they form a circle. Press together firmly.

  7. Carefully remove the halves of your bath bomb mold (don't twist them) and remove your sphere. Then place it on a plate to dry for a few hours or overnight.

    Note: If your bath bomb doesn't come out completely round for any reason, just use your fingers to gently shape it back into a ball. It's easy to do!

  8. You're done! Once your bath bomb is dry, you can use it in your bath or wrap it up and give it as a far out gift for a friend.

Glitter: Why aren't we using it?

You might be wondering, "Where's the glitter?!" Many bath bombs use glitter, but a lot of types of glitter can actually be either unhealthy (glitter containing aluminum or sugar) or bad for the environment (those that contain plastic).

There is good news, though! Lush uses a vegetable-based product called lustre in their bath bombs that is healthy for you and for the planet. If you'd like to add a little shimmer to your galaxy bath bomb, this is a great way to go!

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