Age range: 14-16
Duration: 0 - 29 mins
  • Maths

Counting stars using estimation

Decide on a systematic way to estimate the number of objects in an image

The Hubble Space Telescope is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. Although not the first space telescope, Hubble is one of the largest and most versatile, and is a well known research tool for astronomy.

With a 2.4-meter (7.9 ft) mirror, Hubble's four main instruments observe in the near ultraviolet, visible, and near infrared spectra. Hubble's orbit outside the distortion of Earth's atmosphere allows it to take extremely high-resolution images, with substantially lower background light than ground-based telescopes. Hubble has recorded some of the most detailed visible light images ever, allowing a deep view into space and time. Many Hubble observations have led to breakthroughs in astrophysics, such as accurately determining the rate of expansion of the universe.

Activity info, teachers' notes and curriculum links

An engaging activity in which students will estimate the number of stars in various images from the Hubble telescope.

The activity sheet includes teacher notes, guidance, useful web links, and links (where appropriate) to the national curriculum in each of the four devolved UK nations; England, Northern Ireland, Scotland and Wales.

Remember, it's all free!...and registration is free too!

All activity sheets and supporting resources are free to download, and all the documents are fully editable, so you can tailor them to your students' and your schools' needs.

Available downloads

To download any of the resources on this page please login or register

Activity overview

Counting stars using estimation activity description, teachers' notes and curriculum links.



Estimate the number of stars from various telescope images.



Counting stars - students must estimate the number of stars in each image.