*NASA's Hubble Space Telescope has captured the closest and most detailed images yet of comet C/2019 Y4 (ATLAS), which is currently making its way toward the sun.*

The images, taken on April 20 and 21, 2020, reveal a complex structure within the comet's coma, or head, and a long, thin tail. The coma is made up of gas and dust that has been ejected from the comet's nucleus as it approaches the sun. The tail is made up of dust that has been swept away from the coma by the solar wind.

The new images also show that the comet has a small, dark nucleus, which is about 1 kilometer (0.6 miles) in diameter. This is the first time the comet's nucleus has been seen in such detail.

Comet C/2019 Y4 (ATLAS) was discovered in December 2019 by the Asteroid Terrestrial-impact Last Alert System (ATLAS) survey. The comet is currently about 140 million kilometers (87 million miles) from the sun and is moving closer. It is expected to make its closest approach to the sun on May 31, 2020.

The Hubble Space Telescope is a joint project of NASA and the European Space Agency (ESA). It is the most powerful space telescope in the world and has been in orbit around the Earth since 1990.