ExploraTour: A Peek into the Lives of the Stars


Click on image for full size
Image from the Hubble Space Telescope, reproduced with permission from AURA/STScI.

Possible Black Hole at the Core of NGC 4261.

This is a Hubble Space Telescope image of a possible giant black hole at the center of the elliptical galaxy NGC 4261.

The black hole cannot be viewed directly since it emits no light. However, a giant disk of gas and dust being drawn into the black hole is heated near the black hole and is made visible through the light that it emits. The disk is thought to be about 300 light years across.


Shop Windows to the Universe Science Store!

Enjoy your love of minerals and fossils through jewelry! We have beautiful Nature's Own jewelry in our online store, including earrings, necklaces, and pendants!

You might also be interested in:

Banded Iron Formation

Check out our online store - minerals, fossils, books, activities, jewelry, and household items!...more

ExploraTour: A Peek into the Lives of the Stars

STAGE 4b: Black Hole If the central core, that remains after the supernova blast, is greater than 3 times the sun's mass, the internal pressure cannot halt the gravitational collapse. The core will continue...more

ExploraTour - Looking at the World in a Different Light

Even though the sleeping man is no longer on the bed, you can still see where he was lying down. The heat from his body warmed up the bed sheets which are now radiating infrared light toward your eyes....more

ExploraTour - Looking at the World in a Different Light

All warm objects radiate in the infrared. The warmer the object, the higher the frequency and intensity of the radiation. Very hot objects give off other types of radiation in addition to infrared. Click...more

ExploraTour - Looking at the World in a Different Light

Your eye is a wonderful detector of visible light. Different frequencies of light produce different sensations in the eye which we interpret as colors. Our eyes detect light by using light sensitive components...more

ExploraTour - Looking at the World in a Different Light

Imagine you found a pair of special glasses that not only gave you telescopic vision but gave you the ability to see all forms of radiant energy. The universe in visible light contains all the familiar...more

ExploraTour - Looking at the World in a Different Light

This is a volcano on the island of Miyake in Japan. It has erupted, sending hot lava and ash into the air, a total of ten times. The time after one eruption until the next occurred was about twenty years...more

ExploraTour - Looking at the World in a Different Light

The awesome power of a giant black hole was revealed by looking at this galaxy in three different types of light. The picture that you see is of Centaurus A, a very peculiar galaxy. A galaxy is just a...more

Shop Windows to the Universe

Young Voices for the Planet DVD in our online store includes 8 films where students speak out and take action on climate change.

Generous sponsorship of Windows to the Universe is provided by the Hewlett Foundation, the American Geological Institute, the American Geophysical Union, the National Science Foundation, NASA, NCAR, and the CISM and CMMAP projects. NASA CMMAP AGU CISM NCAR Hewlett AGI NSF