After the moon, Venus is the brightest object in the night sky — bright enough to cast faint shadows under truly dark conditions, and frequently mistaken for an aircraft or reported as a UFO. It's also one of the strangest worlds in our solar system.
Venus is the hottest planet we know of, with a surface temperature around 870°F — hot enough to melt lead. That's not because it's closest to the sun (Mercury is closer); it's because of a runaway greenhouse effect. Venus's thick atmosphere is almost entirely carbon dioxide, trapping heat so effectively that its surface is hotter than Mercury's despite being nearly twice as far from the sun.
Then there's the rotation. Venus spins backwards — 'retrograde' — meaning the sun rises in the west and sets in the east. And it spins extraordinarily slowly: one full rotation takes 243 Earth days, longer than the 225 days Venus needs to orbit the sun. On Venus, a day is longer than a year.
Because both Earth and Venus are moving, the distance between them swings dramatically — from about 24 million miles at closest approach to over 160 million miles when we're on opposite sides of the sun. That's why Venus's brightness changes so noticeably through the year.
Through a telescope, Venus shows phases like the moon — a discovery Galileo made in 1610 that helped prove the planets orbit the sun, not the Earth. You'll never see surface details (the cloud deck is permanent and unbroken), but watching a crescent Venus hang in the twilight is one of the classic telescope experiences.
On our tours, when Venus is in the evening sky, it's usually the first thing visible — blazing in the west before the sky is even fully dark. Ask your guide to point the telescope at it, and you'll see the phase for yourself.
