Now that you've caught your breath, here's a hard truth: From the get-go, astrology was not intended as an exact science. And as NASA has shown, some of its most foundational values, like these very signs, can be challenged by astrology's hard-science counterpart, astronomy.For those of you scrambling to know what to believe in anymore, it's completely up to you. Some astrologers add that the seasons play a role in determining the signs' dates, but it's really just a matter of whether you subscribe to the zodiac signs or their corresponding constellations.Each person has a different relationship with their sign and horoscope — if they have one at all — so if you'd like this news from NASA to shatter your worldview, by all means, let it. But if you've already invested a fair share of personal meaning into the sign you've believed you were born under all along, that's fine, too.Finally, it's important to keep in mind that this isn't the first time this has happened and it won't be the last — after all, in the next couple thousand years, the earth's axis will probably point in a slightly different direction all over again.