The planets in our solar system do not align in a perfectly straight line very often due to their different orbital periods and inclinations. However, there have been instances where some of the planets appeared to align in the sky, although not precisely. The last notable alignment of several planets in the solar system occurred in 1982.
On March 10, 1982, Jupiter, Venus, and Mercury appeared close together in the evening sky after sunset. This alignment created a visually striking celestial event known as the "planetary conjunction." People were able to observe these three planets in close proximity to each other, forming a triangular pattern.
It's worth mentioning that while these types of alignments can create interesting visual configurations from our perspective on Earth, they do not have any significant physical or gravitational effects on the planets themselves. Planetary alignments are primarily of aesthetic interest to skywatchers and astronomers.