Horwitz-DeRemer Planetarium

Happy 35th Birthday to the Hubble Space Telescope! Hubble was deployed on this date in 1990. Check out this link! Enter your birthday & see what image Hubble captured on your birth date! https://science.nasa.gov/mission/hubble/multimedia/what-did-hubble-see-on-your-birthday/

In the morning, today & tomorrow (weather permitting) will be the ideal time to observe "earthshine!" Earthshine is a dull glow which lights up the unlit part of the Moon because the Sun’s light reflects off the Earth's surface and back onto the Moon. SOURCE: timeanddate.com

It's Earth Day today! Wise words for us all to remember... #wherethestarshangout

Have a great week everyone! Also, don't forget that we have Sunset Meditation on Wednesday. If you are interested in attending, be sure to register ASAP on the Waukesha County website! #wherethestarshangout

Happy Easter, all! #wherethstarshangout

Come and see us at the planetarium today! At 11am, join us for ""Mars: The Ultimate Voyage."" In the afternoon at 1pm, we'll feature ""From Earth to the Universe."" Tickets are $5/person and can be purchased upon arrival or at hdplanetarium.ticketleap.com!

The next few mornings will be ideal to try and take a peek at the planet, Mercury! It will be at its furthest distance from the Sun in the morning sky. This is also known as ""greatest elongation west,"" which officially occurs on April 21st. Catch it if you can!

So far, 2025 has been an great year for viewing planets in our night sky! Did you know that fancy equipment (telescope or binoculars) is NOT needed to see a planet? Your eyes will do just fine! Check out this stellar article all about planet viewing! Source: adlerplanetarium.org

Join us for an excellent show this morning! Our public show for today is ""Voyage to Distant Worlds"" and it starts at 11am. Grab your tickets ahead of time at hdplanetarium.ticketleap.com or walk-ins are welcome, as seats are available! #wherethestarshangout

Our second Sunset Meditation of this spring is coming up next Wednesday, April 23rd! If you are interested, sign up ASAP as registration closes Tuesday 4/22 at 12pm! You may call Retzer at (262) 896-8007 to save your spot(s). This beautiful evening begins at the Horwitz-DeRemer Planetarium at 7:30pm with a peaceful planetarium show. Immediately following, one of Retzer's amazing naturalists will take interested participants on a evening hike on the trails. Cost is $10 per person. Hope you will join us! #wherethestarshangout

In case you haven't heard, from now until April 18, early risers anywhere in the world will get to see an unusual cluster of three planets: Mercury, Venus, & Saturn. Please note: We know that Neptune is labeled in the picture. However, you cannot see Neptune with just you eyes.

Here's our schedule for the week. If you can, we'd love for you to join us for a show! #wherethestarshangout

Thank goodness it's Saturday! We'd love for you to come visit today! Here's our schedule: At 11am, we'll be featuring "Mars: The Ultimate Voyage." Later at 1pm, join us for "From Earth to the Universe." Tickets are only $5 per person. Have a great weekend! #wherethestarshangout

Tomorrow night is April's full moon! It is most commonly known as the Pink Moon. Northern Native Americans gave it that name. But this full moon may also be known as the Sprouting Grass Moon, Growing Moon, Egg Moon or Fish Moon. Which 1 do you prefer?

Calling all early birds! If you want to catch the view of a planet this month...Venus is easier to spot due to its brilliance, particularly if you have a clear eastern horizon. Look for it about 30 minutes before sunrise for best viewing! #wherethestarshangout

As a nod to the one year anniversary of the solar eclipse yesterday, let's check out the show that was a favorite during eclipse season in 2025. Join us at 11am for ""Totality: Explore the Wonder of Eclipses."" It's a great show with terrific information! #wherethestarshangout

Do you remember where you were one year ago today?! It was the Great American Solar Eclipse! We had a beautiful day for viewing in Wisconsin and lots of people gathered here at the planetarium to celebrate. If you took any pictures, share them in the comments! Don't forget to mark your calendars for the next Total Solar Eclipse in Wisconsin...it will be on September 14th, 2099! 🤯 #wherethestarshangout

Another sign that warmer weather *should* be around the corner....the summer triangle has returned! If you are awake around 2am, you may be able to catch a peek in the E! As we head towards summer, it will be visible earlier in the evening! SOURCE: adlerplanetarium.org

Here's our schedule for the week! We have a great show lineup and our first sunset meditation for this spring! Hopefully we'll see you at the planetarium soon! #wherethestarshangout

It's a new month...which means a new pair of Saturday planetarium shows! 11am- "Mars: The Ultimate Voyage" 1pm-"From Earth to the Universe" Tickets for shows are only $5/person/show. Purchasing tickets ahead of time is encouraged & can be done at hdplanetarium.ticketleap.com.