Is the Hubble telescope the smallest than the sun or earth?

Yes, the Hubble Space Telescope is significantly smaller than both the Sun and the Earth. The Hubble telescope is about 13.3 meters (43.5 feet) long and has a diameter of 2.4 meters (7.9 feet) for its primary mirror. In contrast, the Earth has a diameter of about 12,742 kilometers (7,918 miles), and the Sun's diameter is approximately 1.4 million kilometers (864,000 miles), making both celestial bodies many orders of magnitude larger than Hubble.